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This patch adds two more SymbolData subclasses: SymIntExpr and SymSymExpr, for

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representing symbolic expressions like 'x'+3 and 'x'+'y'. The design is
subjected to change later when we fix the class hierarchy of symbolic
expressions.

llvm-svn: 67678
This commit is contained in:
Zhongxing Xu
2009-03-25 05:58:37 +00:00
parent b2304ee0d1
commit 24e7eade19
7 changed files with 152 additions and 28 deletions
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33
clang/lib/Analysis/SimpleConstraintManager.cpp
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@@ -21,28 +21,11 @@ namespace clang {
SimpleConstraintManager::~SimpleConstraintManager() {}
bool SimpleConstraintManager::canReasonAbout(SVal X) const {
if (nonloc::SymIntConstraintVal *Y = dyn_cast<nonloc::SymIntConstraintVal>(&X)) {
const SymIntConstraint& C = Y->getConstraint();
switch (C.getOpcode()) {
// We don't reason yet about bitwise-constraints on symbolic values.
case BinaryOperator::And:
case BinaryOperator::Or:
case BinaryOperator::Xor:
return false;
// We don't reason yet about arithmetic constraints on symbolic values.
case BinaryOperator::Mul:
case BinaryOperator::Div:
case BinaryOperator::Rem:
case BinaryOperator::Add:
case BinaryOperator::Sub:
case BinaryOperator::Shl:
case BinaryOperator::Shr:
return false;
// All other cases.
default:
return true;
}
if (nonloc::SymbolVal* SymVal = dyn_cast<nonloc::SymbolVal>(&X)) {
const SymbolData& data
= getSymbolManager().getSymbolData(SymVal->getSymbol());
return !(data.getKind() == SymbolData::SymIntKind ||
data.getKind() == SymbolData::SymSymKind );
}
return true;
@@ -143,6 +126,12 @@ SimpleConstraintManager::Assume(const GRState* St, NonLoc Cond, bool Assumption,
const GRState*
SimpleConstraintManager::AssumeAux(const GRState* St,NonLoc Cond,
bool Assumption, bool& isFeasible) {
// We cannot reason about SymIntExpr and SymSymExpr.
if (!canReasonAbout(Cond)) {
isFeasible = true;
return St;
}
BasicValueFactory& BasicVals = StateMgr.getBasicVals();
SymbolManager& SymMgr = StateMgr.getSymbolManager();