// Turn all [A, B] ranges to [-B, -A]. Ranges [MIN, B] are turned to range set
// [MIN, MIN] U [-B, MAX], when MIN and MAX are the minimal and the maximal
// signed values of the type.
RangeSet RangeSet::Negate(BasicValueFactory &BV, Factory &F) const {
PrimRangeSet newRanges = F.getEmptySet();
for (iterator i = begin(), e = end(); i != e; ++i) {
const llvm::APSInt &from = i->From(), &to = i->To();
const llvm::APSInt &newTo = (from.isMinSignedValue() ?
BV.getMaxValue(from) :
BV.getValue(- from));
if (to.isMaxSignedValue() && !newRanges.isEmpty() &&
newRanges.begin()->From().isMinSignedValue()) {
assert(newRanges.begin()->To().isMinSignedValue() &&
"Ranges should not overlap");
assert(!from.isMinSignedValue() && "Ranges should not overlap");
const llvm::APSInt &newFrom = newRanges.begin()->From();
newRanges =
F.add(F.remove(newRanges, *newRanges.begin()), Range(newFrom, newTo));
} else if (!to.isMinSignedValue()) {
const llvm::APSInt &newFrom = BV.getValue(- to);
newRanges = F.add(newRanges, Range(newFrom, newTo));
}
if (from.isMinSignedValue()) {
newRanges = F.add(newRanges, Range(BV.getMinValue(from),
BV.getMinValue(from)));
}
}
return newRanges;
}
/// Apply implicit constraints for bitwise OR- and AND-.
/// For unsigned types, bitwise OR with a constant always returns
/// a value greater-or-equal than the constant, and bitwise AND
/// returns a value less-or-equal then the constant.
///
/// Pattern matches the expression \p Sym against those rule,
/// and applies the required constraints.
/// \p Input Previously established expression range set
static RangeSet applyBitwiseConstraints(
BasicValueFactory &BV,
RangeSet::Factory &F,
RangeSet Input,
const SymIntExpr* SIE) {
QualType T = SIE->getType();
bool IsUnsigned = T->isUnsignedIntegerType();
const llvm::APSInt &RHS = SIE->getRHS();
const llvm::APSInt &Zero = BV.getAPSIntType(T).getZeroValue();
BinaryOperator::Opcode Operator = SIE->getOpcode();
// For unsigned types, the output of bitwise-or is bigger-or-equal than RHS.
if (Operator == BO_Or && IsUnsigned)
return Input.Intersect(BV, F, RHS, BV.getMaxValue(T));
// Bitwise-or with a non-zero constant is always non-zero.
if (Operator == BO_Or && RHS != Zero)
return assumeNonZero(BV, F, SIE, Input);
// For unsigned types, or positive RHS,
// bitwise-and output is always smaller-or-equal than RHS (assuming two's
// complement representation of signed types).
if (Operator == BO_And && (IsUnsigned || RHS >= Zero))
return Input.Intersect(BV, F, BV.getMinValue(T), RHS);
return Input;
}
/// Return a range set subtracting zero from \p Domain.
static RangeSet assumeNonZero(
BasicValueFactory &BV,
RangeSet::Factory &F,
SymbolRef Sym,
RangeSet Domain) {
APSIntType IntType = BV.getAPSIntType(Sym->getType());
return Domain.Intersect(BV, F, ++IntType.getZeroValue(),
--IntType.getZeroValue());
}
// Returns a set containing the values in the receiving set, intersected with
// the closed range [Lower, Upper]. Unlike the Range type, this range uses
// modular arithmetic, corresponding to the common treatment of C integer
// overflow. Thus, if the Lower bound is greater than the Upper bound, the
// range is taken to wrap around. This is equivalent to taking the
// intersection with the two ranges [Min, Upper] and [Lower, Max],
// or, alternatively, /removing/ all integers between Upper and Lower.
RangeSet RangeSet::Intersect(BasicValueFactory &BV, Factory &F,
llvm::APSInt Lower, llvm::APSInt Upper) const {
if (!pin(Lower, Upper))
return F.getEmptySet();
PrimRangeSet newRanges = F.getEmptySet();
PrimRangeSet::iterator i = begin(), e = end();
if (Lower <= Upper)
IntersectInRange(BV, F, Lower, Upper, newRanges, i, e);
else {
// The order of the next two statements is important!
// IntersectInRange() does not reset the iteration state for i and e.
// Therefore, the lower range most be handled first.
IntersectInRange(BV, F, BV.getMinValue(Upper), Upper, newRanges, i, e);
IntersectInRange(BV, F, Lower, BV.getMaxValue(Lower), newRanges, i, e);
}
return newRanges;
}
SVal nonloc::ConcreteInt::EvalBinOp(BasicValueFactory& BasicVals,
BinaryOperator::Opcode Op,
const nonloc::ConcreteInt& R) const {
const llvm::APSInt* X =
BasicVals.EvaluateAPSInt(Op, getValue(), R.getValue());
if (X)
return nonloc::ConcreteInt(*X);
else
return UndefinedVal();
}
/// AddNE - Create a new RangeSet with the additional constraint that the
/// value be not be equal to V.
RangeSet AddNE(BasicValueFactory &BV, Factory &F, const llvm::APSInt &V) {
PrimRangeSet newRanges = ranges;
// FIXME: We can perhaps enhance ImmutableSet to do this search for us
// in log(N) time using the sorted property of the internal AVL tree.
for (iterator i = begin(), e = end(); i != e; ++i) {
if (i->Includes(V)) {
// Remove the old range.
newRanges = F.Remove(newRanges, *i);
// Split the old range into possibly one or two ranges.
if (V != i->From())
newRanges = F.Add(newRanges, Range(i->From(), BV.Sub1(V)));
if (V != i->To())
newRanges = F.Add(newRanges, Range(BV.Add1(V), i->To()));
// All of the ranges are non-overlapping, so we can stop.
break;
}
}
return newRanges;
}
RangeSet AddGT(BasicValueFactory &BV, Factory &F, const llvm::APSInt &V) {
PrimRangeSet newRanges = F.GetEmptySet();
for (PrimRangeSet::iterator i = begin(), e = end(); i != e; ++i) {
if (i->Includes(V) && i->To() > V)
newRanges = F.Add(newRanges, Range(BV.Add1(V), i->To()));
else if (i->From() > V)
newRanges = F.Add(newRanges, *i);
}
return newRanges;
}
SVal loc::ConcreteInt::evalBinOp(BasicValueFactory& BasicVals,
BinaryOperator::Opcode Op,
const loc::ConcreteInt& R) const {
assert(BinaryOperator::isComparisonOp(Op) || Op == BO_Sub);
const llvm::APSInt *X = BasicVals.evalAPSInt(Op, getValue(), R.getValue());
if (X)
return nonloc::ConcreteInt(*X);
else
return UndefinedVal();
}
SVal loc::ConcreteInt::EvalBinOp(BasicValueFactory& BasicVals,
BinaryOperator::Opcode Op,
const loc::ConcreteInt& R) const {
assert (Op == BinaryOperator::Add || Op == BinaryOperator::Sub ||
(Op >= BinaryOperator::LT && Op <= BinaryOperator::NE));
const llvm::APSInt* X = BasicVals.EvaluateAPSInt(Op, getValue(), R.getValue());
if (X)
return loc::ConcreteInt(*X);
else
return UndefinedVal();
}
void RangeSet::IntersectInRange(BasicValueFactory &BV, Factory &F,
const llvm::APSInt &Lower, const llvm::APSInt &Upper,
PrimRangeSet &newRanges, PrimRangeSet::iterator &i,
PrimRangeSet::iterator &e) const {
// There are six cases for each range R in the set:
// 1. R is entirely before the intersection range.
// 2. R is entirely after the intersection range.
// 3. R contains the entire intersection range.
// 4. R starts before the intersection range and ends in the middle.
// 5. R starts in the middle of the intersection range and ends after it.
// 6. R is entirely contained in the intersection range.
// These correspond to each of the conditions below.
for (/* i = begin(), e = end() */; i != e; ++i) {
if (i->To() < Lower) {
continue;
}
if (i->From() > Upper) {
break;
}
if (i->Includes(Lower)) {
if (i->Includes(Upper)) {
newRanges =
F.add(newRanges, Range(BV.getValue(Lower), BV.getValue(Upper)));
break;
} else
newRanges = F.add(newRanges, Range(BV.getValue(Lower), i->To()));
} else {
if (i->Includes(Upper)) {
newRanges = F.add(newRanges, Range(i->From(), BV.getValue(Upper)));
break;
} else
newRanges = F.add(newRanges, *i);
}
}
}
NonLoc NonLoc::MakeIntTruthVal(BasicValueFactory& BasicVals, bool b) {
return nonloc::ConcreteInt(BasicVals.getTruthValue(b));
}
nonloc::ConcreteInt
nonloc::ConcreteInt::EvalComplement(BasicValueFactory& BasicVals) const {
return BasicVals.getValue(~getValue());
}
nonloc::ConcreteInt
nonloc::ConcreteInt::EvalMinus(BasicValueFactory& BasicVals, UnaryOperator* U) const {
assert (U->getType() == U->getSubExpr()->getType());
assert (U->getType()->isIntegerType());
return BasicVals.getValue(-getValue());
}
NonLoc NonLoc::MakeIntVal(BasicValueFactory& BasicVals, uint64_t X,
bool isUnsigned) {
return nonloc::ConcreteInt(BasicVals.getIntValue(X, isUnsigned));
}
Loc Loc::MakeNull(BasicValueFactory &BasicVals) {
return loc::ConcreteInt(BasicVals.getZeroWithPtrWidth());
}
nonloc::LocAsInteger nonloc::LocAsInteger::Make(BasicValueFactory& Vals, Loc V,
unsigned Bits) {
return LocAsInteger(Vals.getPersistentSValWithData(V, Bits));
}
NonLoc NonLoc::MakeCompoundVal(QualType T, llvm::ImmutableList<SVal> Vals,
BasicValueFactory& BasicVals) {
return nonloc::CompoundVal(BasicVals.getCompoundValData(T, Vals));
}
NonLoc NonLoc::MakeVal(BasicValueFactory& BasicVals, const llvm::APSInt& I) {
return nonloc::ConcreteInt(BasicVals.getValue(I));
}
NonLoc NonLoc::MakeVal(BasicValueFactory& BasicVals, const llvm::APInt& I,
bool isUnsigned) {
return nonloc::ConcreteInt(BasicVals.getValue(I, isUnsigned));
}
NonLoc NonLoc::MakeVal(BasicValueFactory& BasicVals, IntegerLiteral* I) {
return nonloc::ConcreteInt(BasicVals.getValue(APSInt(I->getValue(),
I->getType()->isUnsignedIntegerType())));
}
NonLoc NonLoc::MakeVal(BasicValueFactory& BasicVals, uint64_t X, QualType T) {
return nonloc::ConcreteInt(BasicVals.getValue(X, T));
}
NonLoc NonLoc::MakeVal(BasicValueFactory& BasicVals, uint64_t X,
unsigned BitWidth, bool isUnsigned) {
return nonloc::ConcreteInt(BasicVals.getValue(X, BitWidth, isUnsigned));
}