private static Statement GetMinContinueClosure(StatEdge edge)
{
Statement closure = edge.closure;
while (true)
{
bool found = false;
foreach (Statement st in closure.GetStats())
{
if (st.ContainsStatementStrict(edge.GetSource()))
{
if (MergeHelper.IsDirectPath(st, edge.GetDestination()))
{
closure = st;
found = true;
break;
}
}
}
if (!found)
{
break;
}
}
return(closure);
}
public static void LowClosures(Statement stat)
{
foreach (StatEdge edge in new List <StatEdge>(stat.GetLabelEdges()))
{
if (edge.GetType() == StatEdge.Type_Break)
{
// FIXME: ?
foreach (Statement st in stat.GetStats())
{
if (st.ContainsStatementStrict(edge.GetSource()))
{
if (MergeHelper.IsDirectPath(st, edge.GetDestination()))
{
st.AddLabeledEdge(edge);
}
}
}
}
}
foreach (Statement st in stat.GetStats())
{
LowClosures(st);
}
}
// FIXME: rewrite the entire method!!! keep in mind finally exits!!
private static bool ReorderIf(IfStatement ifstat)
{
if (ifstat.iftype == IfStatement.Iftype_Ifelse)
{
return(false);
}
bool ifdirect;
bool elsedirect;
bool noifstat = false;
bool noelsestat;
bool ifdirectpath = false;
bool elsedirectpath = false;
Statement parent = ifstat.GetParent();
Statement from = parent.type == Statement.Type_Sequence ? parent : ifstat;
Statement next = GetNextStatement(from);
if (ifstat.GetIfstat() == null)
{
noifstat = true;
ifdirect = ifstat.GetIfEdge().GetType() == StatEdge.Type_Finallyexit || MergeHelper
.IsDirectPath(from, ifstat.GetIfEdge().GetDestination());
}
else
{
List <StatEdge> lstSuccs = ifstat.GetIfstat().GetAllSuccessorEdges();
ifdirect = !(lstSuccs.Count == 0) && lstSuccs[0].GetType() == StatEdge.Type_Finallyexit ||
HasDirectEndEdge(ifstat.GetIfstat(), from);
}
Statement last = parent.type == Statement.Type_Sequence ? parent.GetStats().GetLast
() : ifstat;
noelsestat = (last == ifstat);
elsedirect = !(last.GetAllSuccessorEdges().Count == 0) && last.GetAllSuccessorEdges
()[0].GetType() == StatEdge.Type_Finallyexit || HasDirectEndEdge(last, from);
if (!noelsestat && ExistsPath(ifstat, ifstat.GetAllSuccessorEdges()[0].GetDestination
()))
{
return(false);
}
if (!ifdirect && !noifstat)
{
ifdirectpath = ExistsPath(ifstat, next);
}
if (!elsedirect && !noelsestat)
{
SequenceStatement sequence = (SequenceStatement)parent;
for (int i = sequence.GetStats().Count - 1; i >= 0; i--)
{
Statement sttemp = sequence.GetStats()[i];
if (sttemp == ifstat)
{
break;
}
else if (elsedirectpath = ExistsPath(sttemp, next))
{
break;
}
}
}
if ((ifdirect || ifdirectpath) && (elsedirect || elsedirectpath) && !noifstat &&
!noelsestat)
{
// if - then - else
SequenceStatement sequence = (SequenceStatement)parent;
// build and cut the new else statement
List <Statement> lst = new List <Statement>();
for (int i = sequence.GetStats().Count - 1; i >= 0; i--)
{
Statement sttemp = sequence.GetStats()[i];
if (sttemp == ifstat)
{
break;
}
else
{
lst.Add(0, sttemp);
}
}
Statement stelse;
if (lst.Count == 1)
{
stelse = lst[0];
}
else
{
stelse = new SequenceStatement(lst);
stelse.SetAllParent();
}
ifstat.RemoveSuccessor(ifstat.GetAllSuccessorEdges()[0]);
foreach (Statement st in lst)
{
sequence.GetStats().RemoveWithKey(st.id);
}
StatEdge elseedge = new StatEdge(StatEdge.Type_Regular, ifstat.GetFirst(), stelse
);
ifstat.GetFirst().AddSuccessor(elseedge);
ifstat.SetElsestat(stelse);
ifstat.SetElseEdge(elseedge);
ifstat.GetStats().AddWithKey(stelse, stelse.id);
stelse.SetParent(ifstat);
// if(next.type != Statement.TYPE_DUMMYEXIT && (ifdirect || elsedirect)) {
// StatEdge breakedge = new StatEdge(StatEdge.TYPE_BREAK, ifstat, next);
// sequence.addLabeledEdge(breakedge);
// ifstat.addSuccessor(breakedge);
// }
ifstat.iftype = IfStatement.Iftype_Ifelse;
}
else if (ifdirect && (!elsedirect || (noifstat && !noelsestat)))
{
// if - then
// negate the if condition
IfExprent statexpr = ifstat.GetHeadexprent();
statexpr.SetCondition(new FunctionExprent(FunctionExprent.Function_Bool_Not, statexpr
.GetCondition(), null));
if (noelsestat)
{
StatEdge ifedge = ifstat.GetIfEdge();
StatEdge elseedge = ifstat.GetAllSuccessorEdges()[0];
if (noifstat)
{
ifstat.GetFirst().RemoveSuccessor(ifedge);
ifstat.RemoveSuccessor(elseedge);
ifedge.SetSource(ifstat);
elseedge.SetSource(ifstat.GetFirst());
ifstat.AddSuccessor(ifedge);
ifstat.GetFirst().AddSuccessor(elseedge);
ifstat.SetIfEdge(elseedge);
}
else
{
Statement ifbranch = ifstat.GetIfstat();
SequenceStatement newseq = new SequenceStatement(Sharpen.Arrays.AsList(ifstat, ifbranch
));
ifstat.GetFirst().RemoveSuccessor(ifedge);
ifstat.GetStats().RemoveWithKey(ifbranch.id);
ifstat.SetIfstat(null);
ifstat.RemoveSuccessor(elseedge);
elseedge.SetSource(ifstat.GetFirst());
ifstat.GetFirst().AddSuccessor(elseedge);
ifstat.SetIfEdge(elseedge);
ifstat.GetParent().ReplaceStatement(ifstat, newseq);
newseq.SetAllParent();
ifstat.AddSuccessor(new StatEdge(StatEdge.Type_Regular, ifstat, ifbranch));
}
}
else
{
SequenceStatement sequence = (SequenceStatement)parent;
// build and cut the new else statement
List <Statement> lst = new List <Statement>();
for (int i = sequence.GetStats().Count - 1; i >= 0; i--)
{
Statement sttemp = sequence.GetStats()[i];
if (sttemp == ifstat)
{
break;
}
else
{
lst.Add(0, sttemp);
}
}
Statement stelse;
if (lst.Count == 1)
{
stelse = lst[0];
}
else
{
stelse = new SequenceStatement(lst);
stelse.SetAllParent();
}
ifstat.RemoveSuccessor(ifstat.GetAllSuccessorEdges()[0]);
foreach (Statement st in lst)
{
sequence.GetStats().RemoveWithKey(st.id);
}
if (noifstat)
{
StatEdge ifedge = ifstat.GetIfEdge();
ifstat.GetFirst().RemoveSuccessor(ifedge);
ifedge.SetSource(ifstat);
ifstat.AddSuccessor(ifedge);
}
else
{
Statement ifbranch = ifstat.GetIfstat();
ifstat.GetFirst().RemoveSuccessor(ifstat.GetIfEdge());
ifstat.GetStats().RemoveWithKey(ifbranch.id);
ifstat.AddSuccessor(new StatEdge(StatEdge.Type_Regular, ifstat, ifbranch));
sequence.GetStats().AddWithKey(ifbranch, ifbranch.id);
ifbranch.SetParent(sequence);
}
StatEdge newifedge = new StatEdge(StatEdge.Type_Regular, ifstat.GetFirst(), stelse
);
ifstat.GetFirst().AddSuccessor(newifedge);
ifstat.SetIfstat(stelse);
ifstat.SetIfEdge(newifedge);
ifstat.GetStats().AddWithKey(stelse, stelse.id);
stelse.SetParent(ifstat);
}
}
else
{
return(false);
}
return(true);
}
private static bool HasDirectEndEdge(Statement stat, Statement from)
{
foreach (StatEdge edge in stat.GetAllSuccessorEdges())
{
if (MergeHelper.IsDirectPath(from, edge.GetDestination()))
{
return(true);
}
}
if (stat.GetExprents() == null)
{
switch (stat.type)
{
case Statement.Type_Sequence:
{
return(HasDirectEndEdge(stat.GetStats().GetLast(), from));
}
case Statement.Type_Catchall:
case Statement.Type_Trycatch:
{
foreach (Statement st in stat.GetStats())
{
if (HasDirectEndEdge(st, from))
{
return(true);
}
}
break;
}
case Statement.Type_If:
{
IfStatement ifstat = (IfStatement)stat;
if (ifstat.iftype == IfStatement.Iftype_Ifelse)
{
return(HasDirectEndEdge(ifstat.GetIfstat(), from) || HasDirectEndEdge(ifstat.GetElsestat
(), from));
}
break;
}
case Statement.Type_Syncronized:
{
return(HasDirectEndEdge(stat.GetStats()[1], from));
}
case Statement.Type_Switch:
{
foreach (Statement st in stat.GetStats())
{
if (HasDirectEndEdge(st, from))
{
return(true);
}
}
break;
}
}
}
return(false);
}
private static int IntegrateExits(Statement stat)
{
int ret = 0;
Statement dest;
if (stat.GetExprents() == null)
{
while (true)
{
int changed = 0;
foreach (Statement st in stat.GetStats())
{
changed = IntegrateExits(st);
if (changed > 0)
{
ret = 1;
break;
}
}
if (changed == 0)
{
break;
}
}
if (stat.type == Statement.Type_If)
{
IfStatement ifst = (IfStatement)stat;
if (ifst.GetIfstat() == null)
{
StatEdge ifedge = ifst.GetIfEdge();
dest = IsExitEdge(ifedge);
if (dest != null)
{
BasicBlockStatement bstat = new BasicBlockStatement(new BasicBlock(DecompilerContext
.GetCounterContainer().GetCounterAndIncrement(CounterContainer.Statement_Counter
)));
bstat.SetExprents(DecHelper.CopyExprentList(dest.GetExprents()));
ifst.GetFirst().RemoveSuccessor(ifedge);
StatEdge newedge = new StatEdge(StatEdge.Type_Regular, ifst.GetFirst(), bstat);
ifst.GetFirst().AddSuccessor(newedge);
ifst.SetIfEdge(newedge);
ifst.SetIfstat(bstat);
ifst.GetStats().AddWithKey(bstat, bstat.id);
bstat.SetParent(ifst);
StatEdge oldexitedge = dest.GetAllSuccessorEdges()[0];
StatEdge newexitedge = new StatEdge(StatEdge.Type_Break, bstat, oldexitedge.GetDestination
());
bstat.AddSuccessor(newexitedge);
oldexitedge.closure.AddLabeledEdge(newexitedge);
ret = 1;
}
}
}
}
if (stat.GetAllSuccessorEdges().Count == 1 && stat.GetAllSuccessorEdges()[0].GetType
() == StatEdge.Type_Break && (stat.GetLabelEdges().Count == 0))
{
Statement parent = stat.GetParent();
if (stat != parent.GetFirst() || (parent.type != Statement.Type_If && parent.type
!= Statement.Type_Switch))
{
StatEdge destedge = stat.GetAllSuccessorEdges()[0];
dest = IsExitEdge(destedge);
if (dest != null)
{
stat.RemoveSuccessor(destedge);
BasicBlockStatement bstat = new BasicBlockStatement(new BasicBlock(DecompilerContext
.GetCounterContainer().GetCounterAndIncrement(CounterContainer.Statement_Counter
)));
bstat.SetExprents(DecHelper.CopyExprentList(dest.GetExprents()));
StatEdge oldexitedge = dest.GetAllSuccessorEdges()[0];
StatEdge newexitedge = new StatEdge(StatEdge.Type_Break, bstat, oldexitedge.GetDestination
());
bstat.AddSuccessor(newexitedge);
oldexitedge.closure.AddLabeledEdge(newexitedge);
SequenceStatement block = new SequenceStatement(Sharpen.Arrays.AsList(stat, bstat
));
block.SetAllParent();
parent.ReplaceStatement(stat, block);
// LabelHelper.lowContinueLabels not applicable because of forward continue edges
// LabelHelper.lowContinueLabels(block, new HashSet<StatEdge>());
// do it by hand
foreach (StatEdge prededge in block.GetPredecessorEdges(StatEdge.Type_Continue))
{
block.RemovePredecessor(prededge);
prededge.GetSource().ChangeEdgeNode(Statement.Direction_Forward, prededge, stat);
stat.AddPredecessor(prededge);
stat.AddLabeledEdge(prededge);
}
stat.AddSuccessor(new StatEdge(StatEdge.Type_Regular, stat, bstat));
foreach (StatEdge edge in dest.GetAllPredecessorEdges())
{
if (!edge.@explicit && stat.ContainsStatementStrict(edge.GetSource()) && MergeHelper
.IsDirectPath(edge.GetSource().GetParent(), bstat))
{
dest.RemovePredecessor(edge);
edge.GetSource().ChangeEdgeNode(Statement.Direction_Forward, edge, bstat);
bstat.AddPredecessor(edge);
if (!stat.ContainsStatementStrict(edge.closure))
{
stat.AddLabeledEdge(edge);
}
}
}
ret = 2;
}
}
}
return(ret);
}
