internal static void CreateMethodBody(Emit.DynamicMethod dynamicMethod, DynamicMethodRequest methodRequest, Type[] args)
{
var generator = dynamicMethod.GetILGenerator();
for (var i = 0; i < args.Length; i++)
{
generator.Emit(OpCodes.Ldarg, i);
}
if (methodRequest.Member is MethodInfo)
{
var method = (MethodInfo)methodRequest.Member;
var opCode = methodRequest.IsStatic ? OpCodes.Call : OpCodes.Callvirt;
generator.EmitCall(opCode, method, null);
}
else if (methodRequest.Member is FieldInfo)
{
var method = (FieldInfo)methodRequest.Member;
var isInput = methodRequest.DataFlowDirection == DataFlowDirection.Input;
var opCode = methodRequest.IsStatic
? (isInput ? OpCodes.Stsfld : OpCodes.Ldsfld)
: (isInput ? OpCodes.Stfld : OpCodes.Ldfld);
generator.Emit(opCode, method);
}
generator.Emit(OpCodes.Ret);
}
public DynamicMethod <TResult> GetFunction <TResult>(DynamicMethodRequest methodRequest)
{
var method = GetDelegate(methodRequest);
return(new DynamicMethod <TResult>
{
Invoker = method.invoker,
DeclaringType = method.declaringType,
ArgumentTypes = method.argTypes,
IsStatic = methodRequest.IsStatic,
});
}
internal (Delegate invoker, Type[] argTypes, Type declaringType) GetDelegate(DynamicMethodRequest methodRequest)
{
var declaringType = methodRequest.Member.DeclaringType;
var argTypes = GetArgTypes(methodRequest);
var method = new Emit.DynamicMethod(methodRequest.Member.Name, methodRequest.ReturnType, argTypes);
CreateMethodBody(method, methodRequest, argTypes);
var delegateType = CreateDelegateType(argTypes, methodRequest.ReturnType);
var invoker = method.CreateDelegate(delegateType);
return(invoker, argTypes, declaringType);
}
internal static Type[] GetArgTypes(DynamicMethodRequest methodRequest)
{
if (methodRequest.IsStatic)
{
return(methodRequest.ParameterTypes);
}
else
{
var argTypes = new Type[methodRequest.ParameterTypes.Length + 1];
argTypes[0] = methodRequest.Member.DeclaringType;
Array.Copy(methodRequest.ParameterTypes, 0, argTypes, 1, methodRequest.ParameterTypes.Length);
return(argTypes);
}
}