// *****************************************************************************
// public methods
// *****************************************************************************
public static Statement IsHead2Block(Statement head)
{
if (head.GetLastBasicType() != Statement.Lastbasictype_General)
{
return(null);
}
// at most one outgoing edge
StatEdge edge = null;
List <StatEdge> lstSuccs = head.GetSuccessorEdges(Statedge_Direct_All);
if (!(lstSuccs.Count == 0))
{
edge = lstSuccs[0];
}
if (edge != null && edge.GetType() == StatEdge.Type_Regular)
{
Statement stat = edge.GetDestination();
if (stat != head && stat.GetPredecessorEdges(StatEdge.Type_Regular).Count == 1 &&
!stat.IsMonitorEnter())
{
if (stat.GetLastBasicType() == Statement.Lastbasictype_General)
{
if (DecHelper.CheckStatementExceptions(Sharpen.Arrays.AsList(head, stat)))
{
return(new SequenceStatement(head, stat));
}
}
}
}
return(null);
}
// *****************************************************************************
// public methods
// *****************************************************************************
public static Statement IsHead(Statement head)
{
if (head.GetLastBasicType() != Statement.Lastbasictype_General)
{
return(null);
}
HashSet <Statement> setHandlers = DecHelper.GetUniquePredExceptions(head);
if (setHandlers.Count != 1)
{
return(null);
}
foreach (StatEdge edge in head.GetSuccessorEdges(StatEdge.Type_Exception))
{
Statement exc = edge.GetDestination();
if (edge.GetExceptions() == null && exc.GetLastBasicType() == Lastbasictype_General &&
setHandlers.Contains(exc))
{
List <StatEdge> lstSuccs = exc.GetSuccessorEdges(Statedge_Direct_All);
if ((lstSuccs.Count == 0) || lstSuccs[0].GetType() != StatEdge.Type_Regular)
{
if (head.IsMonitorEnter() || exc.IsMonitorEnter())
{
return(null);
}
if (DecHelper.CheckStatementExceptions(Sharpen.Arrays.AsList(head, exc)))
{
return(new CatchAllStatement(head, exc));
}
}
}
}
return(null);
}
// *****************************************************************************
// public methods
// *****************************************************************************
public static Statement IsHead(Statement head)
{
if (head.type == Type_Basicblock && head.GetLastBasicType() == Lastbasictype_If)
{
int regsize = head.GetSuccessorEdges(StatEdge.Type_Regular).Count;
Statement p = null;
bool ok = (regsize < 2);
if (!ok)
{
List <Statement> lst = new List <Statement>();
if (DecHelper.IsChoiceStatement(head, lst))
{
p = lst.RemoveAtReturningValue(0);
foreach (Statement st in lst)
{
if (st.IsMonitorEnter())
{
return(null);
}
}
ok = DecHelper.CheckStatementExceptions(lst);
}
}
if (ok)
{
return(new IfStatement(head, regsize, p));
}
}
return(null);
}
// *****************************************************************************
// public methods
// *****************************************************************************
public static Statement IsHead(Statement head)
{
if (head.type == Statement.Type_Basicblock && head.GetLastBasicType() == Statement
.Lastbasictype_Switch)
{
List <Statement> lst = new List <Statement>();
if (DecHelper.IsChoiceStatement(head, lst))
{
Statement post = lst.RemoveAtReturningValue(0);
foreach (Statement st in lst)
{
if (st.IsMonitorEnter())
{
return(null);
}
}
if (DecHelper.CheckStatementExceptions(lst))
{
return(new SwitchStatement(head, post));
}
}
}
return(null);
}
// *****************************************************************************
// public methods
// *****************************************************************************
public static Statement IsHead(Statement head)
{
if (head.GetLastBasicType() != Lastbasictype_General)
{
return(null);
}
HashSet <Statement> setHandlers = DecHelper.GetUniquePredExceptions(head);
if (!(setHandlers.Count == 0))
{
int hnextcount = 0;
// either no statements with connection to next, or more than 1
Statement next = null;
List <StatEdge> lstHeadSuccs = head.GetSuccessorEdges(Statedge_Direct_All);
if (!(lstHeadSuccs.Count == 0) && lstHeadSuccs[0].GetType() == StatEdge.Type_Regular)
{
next = lstHeadSuccs[0].GetDestination();
hnextcount = 2;
}
foreach (StatEdge edge in head.GetSuccessorEdges(StatEdge.Type_Exception))
{
Statement stat = edge.GetDestination();
bool handlerok = true;
if (edge.GetExceptions() != null && setHandlers.Contains(stat))
{
if (stat.GetLastBasicType() != Lastbasictype_General)
{
handlerok = false;
}
else
{
List <StatEdge> lstStatSuccs = stat.GetSuccessorEdges(Statedge_Direct_All);
if (!(lstStatSuccs.Count == 0) && lstStatSuccs[0].GetType() == StatEdge.Type_Regular)
{
Statement statn = lstStatSuccs[0].GetDestination();
if (next == null)
{
next = statn;
}
else if (next != statn)
{
handlerok = false;
}
if (handlerok)
{
hnextcount++;
}
}
}
}
else
{
handlerok = false;
}
if (!handlerok)
{
setHandlers.Remove(stat);
}
}
if (hnextcount != 1 && !(setHandlers.Count == 0))
{
List <Statement> lst = new List <Statement>();
lst.Add(head);
Sharpen.Collections.AddAll(lst, setHandlers);
foreach (Statement st in lst)
{
if (st.IsMonitorEnter())
{
return(null);
}
}
if (DecHelper.CheckStatementExceptions(lst))
{
return(new CatchStatement(head, next, setHandlers));
}
}
}
return(null);
}
