// IfStmt
public override bool Walk(IfStmt node)
{
BitArray result = new BitArray(bits.Length, true);
BitArray save = bits;
bits = new BitArray(bits.Length);
foreach (IfStmtTest ist in node.tests)
{
// Set the initial branch value to bits
bits.SetAll(false);
bits.Or(save);
// Flow the test first
ist.test.Walk(this);
// Flow the body
ist.body.Walk(this);
// Intersect
result.And(bits);
}
// Set the initial branch value to bits
bits.SetAll(false);
bits.Or(save);
if (node.elseStmt != null)
{
// Flow the else_
node.elseStmt.Walk(this);
}
// Intersect
result.And(bits);
bits = save;
// Remember the result
bits.SetAll(false);
bits.Or(result);
return(false);
}
public virtual void PostWalk(IfStmt node)
{
}
// IfStmt
public virtual bool Walk(IfStmt node)
{
return(true);
}
// IfStmt
public virtual bool Walk(IfStmt node)
{
return(false);
}