public static List <ForStatementBlock> Find(MethodDefinition method)
{
List <ForStatementBlock> list = new List <ForStatementBlock>();
if (method == null || !method.HasBody)
{
return(list);
}
Collection <Instruction> ic = method.Body.Instructions;
if (ic.Count < 1)
{
return(list);
}
InsUtils.ComputeIndexes(ic);
for (int i = 0; i < ic.Count; i++)
{
const int maxLoop = 50;
int count = 0;
Instruction insLdci4 = ic[i];
if (!insLdci4.OpCode.Name.StartsWith("ldc.i4"))
{
continue;
}
Instruction insStloc = insLdci4.Next;
count = 0;
while (insStloc != null && !insStloc.OpCode.Name.StartsWith("stloc") &&
count < maxLoop)
{
insStloc = insStloc.Next;
count++;
}
if (insStloc == null || !insStloc.OpCode.Name.StartsWith("stloc"))
{
continue;
}
Instruction insBr = insStloc.Next;
if (insBr == null || !insBr.OpCode.Name.StartsWith("br") || insBr.Next == null)
{
continue;
}
Instruction insLdloc = insBr.Operand as Instruction;
if (insLdloc == null || !insLdloc.OpCode.Name.StartsWith("ldloc"))
{
continue;
}
Instruction insBlt = insLdloc.Next;
count = 0;
while (insBlt != null && !insBlt.OpCode.Name.StartsWith("blt") &&
!insBlt.OpCode.Name.StartsWith("clt") &&
!insBlt.OpCode.Name.StartsWith("call") &&
count < maxLoop)
{
insBlt = insBlt.Next;
count++;
}
if (insBlt == null)
{
continue;
}
bool skip = false;
if (insBlt.OpCode.Name.StartsWith("blt"))
{
//ok
}
else if (insBlt.OpCode.Name.StartsWith("clt"))
{
if (insBlt.Next != null && insBlt.Next.OpCode.Name.StartsWith("brtrue"))
{
insBlt = insBlt.Next;
}
else
{
skip = true;
}
}
else if (insBlt.OpCode.Name.StartsWith("call"))
{
MethodReference mr = insBlt.Operand as MethodReference;
if (mr.FullName == "System.Boolean System.Collections.IEnumerator::MoveNext()")
{
if (insBlt.Next != null && insBlt.Next.OpCode.Name.StartsWith("brtrue"))
{
insBlt = insBlt.Next;
}
else
{
skip = true;
}
}
else
{
skip = true;
}
}
else
{
skip = true;
}
if (skip)
{
continue;
}
Instruction insBrNext = insBlt.Operand as Instruction;
if (insBrNext == null || insBrNext.Offset != insBr.Next.Offset)
{
continue;
}
int varIndex = InsUtils.GetVariableIndex(insStloc);
if (varIndex < 0)
{
continue;
}
ForStatementBlock fsb = new ForStatementBlock(varIndex, insLdci4.Index, insBlt.Index);
list.Add(fsb);
i = insBlt.Index;
}
return(list);
}
public static List<ForStatementBlock> Find(MethodDefinition method)
{
List<ForStatementBlock> list = new List<ForStatementBlock>();
if (method == null || !method.HasBody)
return list;
Collection<Instruction> ic = method.Body.Instructions;
if (ic.Count < 1)
return list;
InsUtils.ComputeIndexes(ic);
for (int i = 0; i < ic.Count; i++)
{
const int maxLoop = 50;
int count = 0;
Instruction insLdci4 = ic[i];
if (!insLdci4.OpCode.Name.StartsWith("ldc.i4"))
continue;
Instruction insStloc = insLdci4.Next;
count = 0;
while (insStloc != null && !insStloc.OpCode.Name.StartsWith("stloc")
&& count < maxLoop)
{
insStloc = insStloc.Next;
count++;
}
if (insStloc == null || !insStloc.OpCode.Name.StartsWith("stloc"))
continue;
Instruction insBr = insStloc.Next;
if (insBr == null || !insBr.OpCode.Name.StartsWith("br") || insBr.Next == null)
continue;
Instruction insLdloc = insBr.Operand as Instruction;
if (insLdloc == null || !insLdloc.OpCode.Name.StartsWith("ldloc"))
continue;
Instruction insBlt = insLdloc.Next;
count = 0;
while (insBlt != null && !insBlt.OpCode.Name.StartsWith("blt")
&& !insBlt.OpCode.Name.StartsWith("clt")
&& !insBlt.OpCode.Name.StartsWith("call")
&& count < maxLoop)
{
insBlt = insBlt.Next;
count++;
}
if (insBlt == null)
continue;
bool skip = false;
if (insBlt.OpCode.Name.StartsWith("blt"))
{
//ok
}
else if (insBlt.OpCode.Name.StartsWith("clt"))
{
if (insBlt.Next != null && insBlt.Next.OpCode.Name.StartsWith("brtrue"))
insBlt = insBlt.Next;
else
skip = true;
}
else if (insBlt.OpCode.Name.StartsWith("call"))
{
MethodReference mr = insBlt.Operand as MethodReference;
if (mr.FullName == "System.Boolean System.Collections.IEnumerator::MoveNext()")
{
if (insBlt.Next != null && insBlt.Next.OpCode.Name.StartsWith("brtrue"))
insBlt = insBlt.Next;
else
skip = true;
}
else
{
skip = true;
}
}
else
{
skip = true;
}
if (skip) continue;
Instruction insBrNext = insBlt.Operand as Instruction;
if (insBrNext == null || insBrNext.Offset != insBr.Next.Offset)
continue;
int varIndex = InsUtils.GetVariableIndex(insStloc);
if (varIndex < 0) continue;
ForStatementBlock fsb = new ForStatementBlock(varIndex, insLdci4.Index, insBlt.Index);
list.Add(fsb);
i = insBlt.Index;
}
return list;
}
