private HashSet<VariableDescriptor> GetControlDependencyVariables(string proc, Block b)
{
// This method works under the assumption that assume statements
// relevant to control flow between basic blocks have the "partition" attribute
HashSet<VariableDescriptor> result = new HashSet<VariableDescriptor>();
var gotoCmd = b.TransferCmd as GotoCmd;
if (gotoCmd != null && gotoCmd.labelTargets.Count >= 2) {
foreach (Block succ in gotoCmd.labelTargets) {
foreach (Cmd c in succ.Cmds) {
AssumeCmd a = c as AssumeCmd;
if (a != null && QKeyValue.FindBoolAttribute(a.Attributes, "partition")) {
var VarCollector = new VariableCollector();
VarCollector.VisitExpr(a.Expr);
result.UnionWith(VarCollector.usedVars.Where(Item => VariableRelevantToAnalysis(Item, proc)).
Select(Item => MakeDescriptor(proc, Item)));
}
else {
break;
}
}
}
}
return result;
}
