public virtual AtomicRE VisitAtomicRE(AtomicRE node)
{
Contract.Requires(node != null);
Contract.Ensures(Contract.Result <AtomicRE>() != null);
node.b = this.VisitBlock(node.b);
return(node);
}
public static VCExpr RegExpr(RE r, VCExpr N, VCContext ctxt)
{
Contract.Requires(r != null);
Contract.Requires(N != null);
Contract.Requires(ctxt != null);
Contract.Ensures(Contract.Result <VCExpr>() != null);
if (r is AtomicRE)
{
AtomicRE ar = (AtomicRE)r;
return(Block(ar.b, N, ctxt));
}
else if (r is Sequential)
{
Sequential s = (Sequential)r;
return(RegExpr(s.first, RegExpr(s.second, N, ctxt), ctxt));
}
else if (r is Choice)
{
Choice ch = (Choice)r;
VCExpr res;
if (ch.rs == null || ch.rs.Count == 0)
{
res = N;
}
else
{
VCExpr currentWLP = RegExpr(cce.NonNull(ch.rs[0]), N, ctxt);
for (int i = 1, n = ch.rs.Count; i < n; i++)
{
currentWLP = ctxt.Ctxt.ExprGen.And(currentWLP, RegExpr(cce.NonNull(ch.rs[i]), N, ctxt));
}
res = currentWLP;
}
return(res);
}
else
{
Contract.Assert(false);
throw new cce.UnreachableException(); // unexpected RE subtype
}
}
public override AtomicRE VisitAtomicRE(AtomicRE node)
{
return(base.VisitAtomicRE((AtomicRE)node.Clone()));
}
public override AtomicRE VisitAtomicRE(AtomicRE node)
{
//Contract.Requires(node != null);
Contract.Ensures(Contract.Result <AtomicRE>() != null);
return(base.VisitAtomicRE((AtomicRE)node.Clone()));
}
public override AtomicRE VisitAtomicRE(AtomicRE node)
{
problematicNode = node;
return(node);
}