private Instruction AddInterceptCall(ILProcessor ilProcessor, MethodDefinition methDef, MethodDefinition interceptMethDef, CustomAttribute att, Instruction insertBefore)
{
var methRef = _assemblyDefinition.MainModule.ImportReference(interceptMethDef);
ilProcessor.InsertBefore(insertBefore, ilProcessor.CreateLoadInstruction(methDef.Name));
int methodParamCount = methDef.Parameters.Count;
int arrayVarNr = methDef.Body.Variables.Count;
if (methodParamCount > 0)
{
ArrayType objArrType = new ArrayType(_assemblyDefinition.MainModule.TypeSystem.Object);
methDef.Body.Variables.Add(new VariableDefinition(objArrType));
methDef.Body.InitLocals = true;
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldc_I4, methodParamCount));
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Newarr, _assemblyDefinition.MainModule.TypeSystem.Object));
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Stloc, arrayVarNr));
bool pointerToValueTypeVariable;
TypeSpecification referencedTypeSpec = null;
for (int i = 0; i < methodParamCount; i++)
{
var paramMetaData = methDef.Parameters[i].ParameterType.MetadataType;
if (paramMetaData == MetadataType.UIntPtr || paramMetaData == MetadataType.FunctionPointer ||
paramMetaData == MetadataType.IntPtr || paramMetaData == MetadataType.Pointer)
{
break;
}
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldloc, arrayVarNr));
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldc_I4, i));
if (methDef.IsStatic)
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldarg, i));
}
else
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldarg, i + 1));
}
pointerToValueTypeVariable = false;
TypeReference paramType = methDef.Parameters[i].ParameterType;
if (paramType.IsByReference)
{
referencedTypeSpec = paramType as TypeSpecification;
if (referencedTypeSpec != null)
{
switch (referencedTypeSpec.ElementType.MetadataType)
{
case MetadataType.Boolean:
case MetadataType.SByte:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_I1));
pointerToValueTypeVariable = true;
break;
case MetadataType.Int16:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_I2));
pointerToValueTypeVariable = true;
break;
case MetadataType.Int32:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_I4));
pointerToValueTypeVariable = true;
break;
case MetadataType.Int64:
case MetadataType.UInt64:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_I8));
pointerToValueTypeVariable = true;
break;
case MetadataType.Byte:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_U1));
pointerToValueTypeVariable = true;
break;
case MetadataType.UInt16:
case MetadataType.Char:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_U2));
pointerToValueTypeVariable = true;
break;
case MetadataType.UInt32:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_U4));
pointerToValueTypeVariable = true;
break;
case MetadataType.Single:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_R4));
pointerToValueTypeVariable = true;
break;
case MetadataType.Double:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_R8));
pointerToValueTypeVariable = true;
break;
case MetadataType.IntPtr:
case MetadataType.UIntPtr:
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_I));
pointerToValueTypeVariable = true;
break;
default:
if (referencedTypeSpec.ElementType.IsValueType)
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldobj, referencedTypeSpec.ElementType));
pointerToValueTypeVariable = true;
}
else
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldind_Ref));
pointerToValueTypeVariable = false;
}
break;
}
}
else
{
}
}
if (paramType.IsValueType || pointerToValueTypeVariable)
{
if (pointerToValueTypeVariable)
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Box, referencedTypeSpec.ElementType));
}
else
{
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Box, paramType));
}
}
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Stelem_Ref));
}
ilProcessor.InsertBefore(insertBefore, ilProcessor.Create(OpCodes.Ldloc, arrayVarNr));
}
var ins = ilProcessor.Create(OpCodes.Callvirt, methDef.Module.ImportReference(interceptMethDef));
ilProcessor.InsertBefore(insertBefore, ins);
return(ins);
}
