public static void RemoveRedundantReturns(RootStatement root)
{
DummyExitStatement dummyExit = root.GetDummyExit();
foreach (StatEdge edge in dummyExit.GetAllPredecessorEdges())
{
if (!edge.@explicit)
{
Statement source = edge.GetSource();
List <Exprent> lstExpr = source.GetExprents();
if (lstExpr != null && !(lstExpr.Count == 0))
{
Exprent expr = lstExpr[lstExpr.Count - 1];
if (expr.type == Exprent.Exprent_Exit)
{
ExitExprent ex = (ExitExprent)expr;
if (ex.GetExitType() == ExitExprent.Exit_Return && ex.GetValue() == null)
{
// remove redundant return
dummyExit.AddBytecodeOffsets(ex.bytecode);
lstExpr.RemoveAtReturningValue(lstExpr.Count - 1);
}
}
}
}
}
}
private static void SetRetEdgesUnlabeled(RootStatement root)
{
Statement exit = root.GetDummyExit();
foreach (StatEdge edge in exit.GetAllPredecessorEdges())
{
List <Exprent> lst = edge.GetSource().GetExprents();
if (edge.GetType() == StatEdge.Type_Finallyexit || (lst != null && !(lst.Count == 0) &&
lst[lst.Count - 1].type == Exprent.Exprent_Exit))
{
edge.labeled = false;
}
}
}
// statement.id, node.id(direct), node.id(continue)
// node.id(source), statement.id(destination), edge type
// node.id(exit), [node.id(source), statement.id(destination)]
// node.id(exit), [node.id(source), statement.id(destination)]
// positive if branches
public virtual DirectGraph BuildDirectGraph(RootStatement root)
{
this.root = root;
graph = new DirectGraph();
FlattenStatement();
// dummy exit node
Statement dummyexit = root.GetDummyExit();
DirectNode node = new DirectNode(DirectNode.Node_Direct, dummyexit, dummyexit.id.
ToString());
node.exprents = new List <Exprent>();
graph.nodes.AddWithKey(node, node.id);
Sharpen.Collections.Put(mapDestinationNodes, dummyexit.id, new string[] { node.id
, null });
SetEdges();
graph.first = graph.nodes.GetWithKey(mapDestinationNodes.GetOrNull(root.id)[0]);
graph.SortReversePostOrder();
return(graph);
}
