private bool ProcessOpCall_retval2(MethodDefinition currentMethod, Instruction callInstruction, MethodReference callMethodRef, string methodOpName)
{
var ILprocessorEx = new ILProcessorEx(currentMethod);
if (Match_Stloc(callInstruction.Next))
{
Instruction StlocInstruction = callInstruction.Next;
int n;
Instruction newLdlocaInstruction = Stloc2Ldloca(ILprocessorEx, StlocInstruction, out n);
Instruction op_outInstruction = GetMethodRefOp2(ILprocessorEx, callMethodRef, methodOpName);
if (op_outInstruction == null)
{
return(false);
}
Console.WriteLine(@"Patching " + callMethodRef.FullName + @" (0x" + callInstruction.Offset.ToString("X") + ")");
Console.WriteLine(@" ...into " + ((MethodReference)op_outInstruction.Operand).FullName);
ILprocessorEx.Remove(StlocInstruction);
ILprocessorEx.InsertBefore(callInstruction, newLdlocaInstruction);
// replace 'valuetype Op(...)' with 'void Op(..., out valuetype)'
ILprocessorEx.Replace(callInstruction, op_outInstruction);
return(true);
}
return(false);
}
private bool ProcessOpCall_retval(MethodDefinition currentMethod, Instruction callInstruction, MethodReference callMethodRef, string methodOpName)
{
var ILprocessorEx = new ILProcessorEx(currentMethod);
int currentParamIdx = callMethodRef.Parameters.Count - 1;
// for now we support only operators (with two arguments). currentParamIdx has to be #1.
if (currentParamIdx != 1)
{
throw new InvalidOperationException();
}
var currentParam = callMethodRef.Parameters[currentParamIdx];
var isCurrentParamByRef = currentParam.ParameterType.IsByReference;
for (var instruction = callInstruction.Previous; instruction != null; instruction = instruction.Previous)
{
//TODO: check if there is a branch target between instruction and callInstruction and quit
// break;
if (isCurrentParamByRef == false)
{
if (Match_Ldloc(instruction))
{
Instruction LdlocInstruction = instruction;
int n;
Instruction newLdlocaInstruction = Ldloc2Ldloca(ILprocessorEx, LdlocInstruction, out n);
Instruction op_refInstruction = GetMethodRefOp(ILprocessorEx, callMethodRef, methodOpName, currentParamIdx);
if (op_refInstruction == null)
{
return(false);
}
Console.WriteLine(@"Patching " + callMethodRef.FullName + @" (0x" + callInstruction.Offset.ToString("X") + ")");
Console.WriteLine(@" ...into " + ((MethodReference)op_refInstruction.Operand).FullName);
// replace 'Ldloc' with 'Ldloca'
ILprocessorEx.Replace(LdlocInstruction, newLdlocaInstruction);
// replace 'vector2 Add(vector2,vector2)' with 'vector2 Add(vector2,vector2)'
ILprocessorEx.Replace(callInstruction, op_refInstruction);
return(true);
}
else if (Match_Ldarg(instruction))
{
Instruction LdargInstruction = instruction;
int n;
Instruction newLdargaInstruction = Ldarg2Ldarga(ILprocessorEx, LdargInstruction, out n);
// check validity of parameter n
var targParam = currentMethod.Parameters[n];
if (targParam.ParameterType.IsByReference == true)
{
throw new InvalidOperationException();
}
Instruction op_refInstruction = GetMethodRefOp(ILprocessorEx, callMethodRef, methodOpName, currentParamIdx);
if (op_refInstruction == null)
{
return(false);
}
Console.WriteLine(@"Patching " + callMethodRef.FullName + @" (0x" + callInstruction.Offset.ToString("X") + ")");
Console.WriteLine(@" ...into " + ((MethodReference)op_refInstruction.Operand).FullName);
// replace 'Ldarg' with 'Ldarga'
ILprocessorEx.Replace(LdargInstruction, newLdargaInstruction);
// replace 'vector2 Add(vector2,vector2)' with 'vector2 Add(vector2, ref vector2)'
ILprocessorEx.Replace(callInstruction, op_refInstruction);
return(true);
}
else if (Match_Ldobj(instruction))
{
Instruction LdobjInstruction = instruction;
var ldtype = LdobjInstruction.Operand;
var type = callMethodRef.Parameters[1];
if (Match_Ldarg(LdobjInstruction.Previous))
{
Instruction LdargInstruction = LdobjInstruction.Previous;
int n;
Instruction newLdargaInstruction = Ldarg2Ldarga(ILprocessorEx, LdargInstruction, out n);
// check validity of parameter n
var targParam = currentMethod.Parameters[n];
if (targParam.ParameterType.IsByReference == false)
{
throw new InvalidOperationException();
}
Instruction op_refInstruction = GetMethodRefOp(ILprocessorEx, callMethodRef, methodOpName, currentParamIdx);
if (op_refInstruction == null)
{
return(false);
}
var callOffset = callInstruction.Offset;
Console.WriteLine(@"Patching " + callMethodRef.FullName + @" (0x" + callInstruction.Offset.ToString("X") + ")");
Console.WriteLine(@" ...into " + ((MethodReference)op_refInstruction.Operand).FullName);
ILprocessorEx.Remove(LdobjInstruction);
// replace 'vector2 Add(vector2,vector2)' with 'vector2 Add(vector2, ref vector2)'
ILprocessorEx.Replace(callInstruction, op_refInstruction);
return(true);
}
}
return(false);
}
else // (isCurrentParamByRef == true)
{
if (Match_Ldloca(instruction))
{
Instruction LdlocaInstruction = instruction;
// argument sucesfully matched. Move to next argument.
if (currentParamIdx == 0)
{
// no more arguments to match.
return(false);
}
else
{
// Move to next argument.
currentParamIdx--;
currentParam = callMethodRef.Parameters[currentParamIdx];
isCurrentParamByRef = currentParam.ParameterType.IsByReference;
continue;
}
}
return(false);
}
if (Match_Nop(instruction))
{
continue;
}
if (Match_Break(instruction))
{
continue;
}
// Unkwown instruction. quit
break;
}
return(false);
}