private string AdjustGoto(IlIns il, bool isDecompile)
{
long lv = IlIns.LabelToValue(il.Value);
string label = null;
if (switchBlocks.ContainsKey(lv))
{
FlowGraphNode gnode = switchBlocks[lv];
DAGNode dnode = switchExpressions[gnode.EndLabelValue];
while (dnode is ReferenceNode)
{
dnode = dnode.NextNodes[0];
}
if (dnode is LeafNode)
{
DAGNode r = GetVarReference(dnode.Data);
if (r != null)
{
int v = (int)ConstUtility.ParseLong(r.Data);
IlIns switchIl = ilLines[gnode.EndLabelValue];
SwitchOperand op = switchIl.Operand as SwitchOperand;
if (v >= 0 && v < op.Labels.Count)
{
label = op.Labels[v];
lv = IlIns.LabelToValue(op.Labels[v]);
}
}
}
}
string label2 = AdjustGoto(il.LabelValue, lv, isDecompile);
if (label2 != null)
{
return(label2);
}
else if (label != null)
{
return(label);
}
return(null);
}
private void BuildFlowGraph()
{
flowGraph = new FlowGraph();
FlowGraphNode curNode = null;
FlowGraphNode prevNode = null;
bool nextIsBlock = true;
for (int i = 0; i < ilLines.Count; i++)
{
IlIns il = ilLines.Values[i];
if (nextIsBlock)
{
nextIsBlock = false;
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
curNode = node;
if (prevNode != null)
{
prevNode.AddNext(node);
}
}
else
{
if (flowGraph.IsNode(il.LabelValue))
{
FlowGraphNode node = flowGraph[il.LabelValue];
curNode.EndLabelValue = GetPrevIlLabelValue(il.LabelValue);
curNode.AddNext(node);
curNode = node;
}
}
IlOpcode op0 = IlOpcodes.GetEH(il.Opcode);
if (op0 != IlOpcode.Prefixref)
{
switch (op0)
{
case IlOpcode.TRY:
{
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
if (curNode != null)
{
curNode.AddNext(node);
}
curNode = node;
}
break;
case IlOpcode.CATCH:
{
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
curNode = node;
}
break;
case IlOpcode.FINALLY:
{
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
curNode = node;
}
break;
case IlOpcode.FILTER:
{
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
curNode = node;
}
break;
case IlOpcode.FAULT:
{
FlowGraphNode node = flowGraph.NewNode(il.LabelValue);
curNode = node;
}
break;
case IlOpcode.ENDTRY:
case IlOpcode.ENDCATCH:
case IlOpcode.ENDFINALLY:
case IlOpcode.ENDFILTER:
case IlOpcode.ENDFAULT:
{
curNode.EndLabelValue = il.LabelValue;
prevNode = null;
nextIsBlock = true;
}
break;
}
}
else
{
OpCode op = IlOpcodes.Get(il.Opcode);
switch ((IlOpcode)op.Value)
{
case IlOpcode.Br:
case IlOpcode.Br_S:
{
long val = IlIns.LabelToValue(il.Value);
FlowGraphNode node = null;
if (val > il.LabelValue)
{
node = flowGraph.NewNode(val);
curNode.AddNext(node);
}
else
{
long prevVal = GetPrevIlLabelValue(val);
FlowGraphNode d = flowGraph.Find(val);
node = flowGraph.Split(val, prevVal);
if (curNode != d)
{
curNode.AddNext(node);
}
else
{
node.AddNext(node);
curNode = node;
}
}
curNode.EndLabelValue = il.LabelValue;
prevNode = null;
nextIsBlock = true;
}
break;
case IlOpcode.Brtrue:
case IlOpcode.Brfalse:
case IlOpcode.Brtrue_S:
case IlOpcode.Brfalse_S:
case IlOpcode.Beq_S:
case IlOpcode.Bge_S:
case IlOpcode.Bgt_S:
case IlOpcode.Ble_S:
case IlOpcode.Blt_S:
case IlOpcode.Bne_Un_S:
case IlOpcode.Bge_Un_S:
case IlOpcode.Bgt_Un_S:
case IlOpcode.Ble_Un_S:
case IlOpcode.Blt_Un_S:
case IlOpcode.Beq:
case IlOpcode.Bge:
case IlOpcode.Bgt:
case IlOpcode.Ble:
case IlOpcode.Blt:
case IlOpcode.Bne_Un:
case IlOpcode.Bge_Un:
case IlOpcode.Bgt_Un:
case IlOpcode.Ble_Un:
case IlOpcode.Blt_Un:
{
long val = IlIns.LabelToValue(il.Value);
FlowGraphNode node = null;
if (val > il.LabelValue)
{
node = flowGraph.NewNode(val);
curNode.AddNext(node);
}
else
{
long prevVal = GetPrevIlLabelValue(val);
FlowGraphNode d = flowGraph.Find(val);
node = flowGraph.Split(val, prevVal);
if (curNode != d)
{
curNode.AddNext(node);
}
else
{
node.AddNext(node);
curNode = node;
}
}
curNode.EndLabelValue = il.LabelValue;
prevNode = curNode;
nextIsBlock = true;
}
break;
case IlOpcode.Switch:
{
SwitchOperand opVal = il.Operand as SwitchOperand;
foreach (string label in opVal.Labels)
{
long val = IlIns.LabelToValue(label);
FlowGraphNode node = null;
if (val > il.LabelValue)
{
node = flowGraph.NewNode(val);
curNode.AddNext(node);
}
else
{
long prevVal = GetPrevIlLabelValue(val);
FlowGraphNode d = flowGraph.Find(val);
node = flowGraph.Split(val, prevVal);
if (curNode != d)
{
curNode.AddNext(node);
}
else
{
node.AddNext(node);
curNode = node;
}
}
}
curNode.EndLabelValue = il.LabelValue;
prevNode = curNode;
nextIsBlock = true;
}
break;
case IlOpcode.Ret:
case IlOpcode.Break:
case IlOpcode.Throw:
case IlOpcode.Rethrow:
case IlOpcode.Leave:
case IlOpcode.Leave_S:
case IlOpcode.Endfilter:
case IlOpcode.Endfinally:
{
curNode.EndLabelValue = il.LabelValue;
prevNode = null;
nextIsBlock = true;
}
break;
}
}
}
}
public static void Set(IlIns il)
{
il.Operand = temp;
temp = new SwitchOperand();
}
