Converting Parameters using Reflection

ConvertingParametersUsingReflection.cs

// The parameters that will be passed to the C# code via reflection
List<object> csharpParameters = new List<object();

// Position of next parameter on the VM stack (+4 because the
// caller’s return address is also on the stack)
ushort vmStackPos = _machine.sp + 4;

// Convert all parameters
foreach (var pi in mi.GetParameters())
{
    if (pi.ParameterType == typeof(ushort))
    {
        // Read 2 bytes from the stack
        csharpParameters.Add(_machine.ReadWord(_machine.ss, vmStackPos));
        vmStackPos += 2;
    }
    else if (pi.ParameterType == typeof(string))
    {
        // Read string pointer from the stack 
        var stringPtr = _machine.ReadDWord(_machine.ss, vmStackPos));
        vmStackPos += 4;
        
        // Read the string from VM memory
        string str = _machine.ReadString(stringPtr);
        csharpParameters.Add(str);
    }
}

// Call the C# function, passing parameters
var retv = mi.Invoke(this, csharpParameter.ToArray());

// Return value to VM
_machine.ax = (ushort)Convert.ChangeType(retv, typeof(ushort));