// TODO: once the constraint manager is smart enough to handle non simplified
// symbolic expressions remove this function. Note that this can not be used in
// the constraint manager as is, since this does not handle overflows. It is
// safe to assume, however, that memory offsets will not overflow.
static std::pair<NonLoc, nonloc::ConcreteInt>
getSimplifiedOffsets(NonLoc offset, nonloc::ConcreteInt extent,
SValBuilder &svalBuilder) {
Optional<nonloc::SymbolVal> SymVal = offset.getAs<nonloc::SymbolVal>();
if (SymVal && SymVal->isExpression()) {
if (const SymIntExpr *SIE = dyn_cast<SymIntExpr>(SymVal->getSymbol())) {
llvm::APSInt constant =
APSIntType(extent.getValue()).convert(SIE->getRHS());
switch (SIE->getOpcode()) {
case BO_Mul:
// The constant should never be 0 here, since it the result of scaling
// based on the size of a type which is never 0.
if ((extent.getValue() % constant) != 0)
return std::pair<NonLoc, nonloc::ConcreteInt>(offset, extent);
else
return getSimplifiedOffsets(
nonloc::SymbolVal(SIE->getLHS()),
svalBuilder.makeIntVal(extent.getValue() / constant),
svalBuilder);
case BO_Add:
return getSimplifiedOffsets(
nonloc::SymbolVal(SIE->getLHS()),
svalBuilder.makeIntVal(extent.getValue() - constant), svalBuilder);
default:
break;
}
}
}
return std::pair<NonLoc, nonloc::ConcreteInt>(offset, extent);
}
SVal nonloc::ConcreteInt::evalBinOp(ValueManager &ValMgr,
BinaryOperator::Opcode Op,
const nonloc::ConcreteInt& R) const {
const llvm::APSInt* X =
ValMgr.getBasicValueFactory().EvaluateAPSInt(Op, getValue(), R.getValue());
if (X)
return nonloc::ConcreteInt(*X);
else
return UndefinedVal();
}
SVal nonloc::ConcreteInt::evalBinOp(SValBuilder &svalBuilder,
BinaryOperator::Opcode Op,
const nonloc::ConcreteInt& R) const {
const llvm::APSInt* X =
svalBuilder.getBasicValueFactory().evalAPSInt(Op, getValue(), R.getValue());
if (X)
return nonloc::ConcreteInt(*X);
else
return UndefinedVal();
}
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();
}
