private bool performLeaveReproduction()
{
bool result = false;
ArrayList leaveBlocks = new ArrayList();
foreach (BasicBlock block in blockList)
{
int count = block.Body.Count;
if (count > 0 && count <= 2)
{
Node lastNode = block.Body[count-1];
if (lastNode is Leave && lastNode.Parent is MethodBodyBlock)
leaveBlocks.Add(block);
}
}
ArrayList leaveBlocksToRemove = new ArrayList();
foreach (BasicBlock block in leaveBlocks)
{
Node opt = (block.Body.Count == 2) ? block.Body[0] : null;
ArrayList prevBlocksToRemove = new ArrayList();
foreach (BasicBlock b in block.Prev)
if (b.Next.Count == 1 && b.Body.Count > 0)
{
NodeArray body = b.Body;
Node lastNode = body[body.Count-1];
if (! (lastNode is Branch))
{
result = true;
prevBlocksToRemove.Add(b);
if (opt != null)
{
Node n = opt.Clone();
n.Options[BasicBlock.BASIC_BLOCK_OPTION] = b;
body.Add(n);
lastNode = lastNode.Next = n;
}
Node l = new Leave();
l.Options[BasicBlock.BASIC_BLOCK_OPTION] = b;
body.Add(l);
lastNode.Next = l;
}
}
foreach (BasicBlock b in prevBlocksToRemove)
{
b.Next.Remove(block);
block.Prev.Remove(b);
}
if (block.Prev.Count == 0)
leaveBlocksToRemove.Add(block);
}
foreach (BasicBlock block in leaveBlocksToRemove)
blockList.Remove(block);
return result;
}
protected internal override void VisitLeave(Leave node, object data)
{
StackTypes stack = data as StackTypes;
if(node.Parent is FilterBlock)
Verifier.ProcessEndFilter(stack);
else if(node.Parent is MethodBodyBlock)
Verifier.ProcessRet(new TypeEx((node.Parent as MethodBodyBlock).ReturnType) , stack);
else //CatchBlock || ProtectedBlock || UserFilteredBlock => stack should be empty
Verifier.ProcessLeave(stack);
if(node.Next != null)
AddTask(node.Next,stack);
}
protected override void VisitLeave(Leave node, object data)
{
if (node.Parent is ProtectedBlock)
AddTask(node.Next);
else if (node.Parent is CatchBlock)
AddTask(node.Next);
else if (! (node.Parent is MethodBodyBlock))
throw new NodeNotSupportedException(node);
}
protected internal virtual void VisitLeave(Leave node, object data)
{
throw new NodeNotSupportedException(node);
}
protected override void VisitLeave(Leave downNode, object o)
{
this.exitData.Add(o);
}
protected override void VisitLeave(Leave upNode, object o)
{
State state = o as State;
MethodBodyBlock mbbUpNode = upNode.Parent as MethodBodyBlock;
if (mbbUpNode.ReturnType != typeof(void))
{
Creators crtrs = BTValue.Merge((state.Stack.Pop() as BTValue).FromStack(), this.ret);
if (! crtrs.IsEmpty)
throw new LiftException(crtrs);
}
Annotation.SetNodeBTType(upNode, BTType.eXclusive);
}
protected override void VisitLeave(Leave upNode, object o)
{
throw new InternalException();
}
protected internal override void VisitLeave(Leave node, object data)
{
prevHasNext = false;
if(node.Parent is MethodBodyBlock)
generator.Emit(OpCodes.Ret);
else if(node.Parent is ProtectedBlock || node.Parent is CatchBlock)
{
generator.Emit(OpCodes.Leave, GetLabel(node.Next) );
tasks.Burrow(node.Next,null);
}
else if(node.Parent is FinallyBlock)
generator.Emit(OpCodes.Endfinally);
else
throw new EmissionException();
}