// IfStatement
protected internal override bool Walk(IfStatement node)
{
BitArray result = new BitArray(_bits.Length, true);
BitArray save = _bits;
_bits = new BitArray(_bits.Length);
foreach (IfStatementTest ist in node.Tests) {
// Set the initial branch value to bits
_bits.SetAll(false);
_bits.Or(save);
// Flow the test first
WalkNode(ist.Test);
// Flow the body
WalkNode(ist.Body);
// Intersect
result.And(_bits);
}
// Set the initial branch value to bits
_bits.SetAll(false);
_bits.Or(save);
if (node.ElseStatement != null) {
// Flow the else_
WalkNode(node.ElseStatement);
}
// Intersect
result.And(_bits);
_bits = save;
// Remember the result
_bits.SetAll(false);
_bits.Or(result);
return false;
}
protected override void PostWalk(IfStatement node)
{
node.Tests[0].Body = Rewrite(node.Tests[0].Body);
if (node.ElseStatement != null)
{
node.ElseStatement = Rewrite(node.ElseStatement);
}
}
// IfStatement
private void DefaultWalk(IfStatement node)
{
if (Walk(node)) {
foreach (IfStatementTest t in node.Tests) {
WalkNode(t);
}
WalkNode(node.ElseStatement);
}
PostWalk(node);
}