/// <summary>
/// Creates a reference to a parameter used in a custom attribute.
/// </summary>
/// <param name="emitter">The emitter.</param>
/// <param name="attribute">The attribute.</param>
/// <param name="arg">The argument.</param>
public void CreateAttributeParameter(MethodEmitter emitter, CustomAttribute attribute, CustomAttributeArgument arg)
{
var il = emitter.GetIL();
if (arg.Value == null)
{
il.Emit(Codes.Null);
return;
}
var type = arg.Type;
if (type.IsArray)
{
var elements = (arg.Value as IEnumerable).Cast <CustomAttributeArgument>().ToArray();
il.Emit(Codes.Int(elements.Length));
il.Emit(Codes.CreateArray(type.GetElementType()));
if (elements.Length == 0)
{
return;
}
il.Emit(Codes.Duplicate);
for (int i = 0, count = elements.Length; i < count; i++)
{
il.Emit(Codes.Int(i));
if (elements[i].Value == null)
{
il.Emit(Codes.Null);
il.Emit(Codes.StoreArray);
}
else
{
il.Emit(Codes.Load(elements[i].Value));
il.Emit(Codes.StoreArray);
}
if (i + 1 < count)
{
il.Emit(Codes.Duplicate);
}
}
}
else
{
il.Emit(Codes.Load(arg.Value));
}
}
/// <summary>
/// Create an array variable containing the arguments of the method invocation.
/// </summary>
/// <param name="method">The method weaver.</param>
/// <returns></returns>
public Variable CreateArgumentArray(MethodEmitter method)
{
var parameters = method.Target.Parameters;
var count = parameters.Count;
var array = method.EmitLocal(Context.Finder.ObjectArray);
var il = method.GetIL();
il.Emit(Codes.Nop);
il.Emit(Codes.Int(count));
il.Emit(Codes.CreateArray(TypeSystem.ObjectReference));
il.Emit(Codes.Store(array));
for (int i = 0; i < count; i++)
{
var p = parameters[i];
var type = p.ParameterType;
il.Emit(Codes.Load(array));
il.Emit(Codes.Int(i));
if (p.IsOut)
{
var spec = (TypeSpecification)type;
if (spec.ElementType.IsValueType)
{
il.Emit(Codes.Init(spec.ElementType));
}
else
{
il.Emit(Codes.Null);
il.Emit(Codes.StoreArray);
}
continue;
}
il.Emit(Codes.Arg(p));
if (type.IsByReference)
{
var spec = (TypeSpecification)type;
var boxing = true;
switch (spec.ElementType.MetadataType)
{
case MetadataType.SByte:
il.Emit(OpCodes.Ldind_I1);
break;
case MetadataType.Int16:
il.Emit(OpCodes.Ldind_I2);
break;
case MetadataType.Int32:
il.Emit(OpCodes.Ldind_I4);
break;
case MetadataType.Int64:
case MetadataType.UInt64:
il.Emit(OpCodes.Ldind_I8);
break;
case MetadataType.Boolean:
case MetadataType.Byte:
il.Emit(OpCodes.Ldind_U1);
break;
case MetadataType.UInt16:
il.Emit(OpCodes.Ldind_U2);
break;
case MetadataType.UInt32:
il.Emit(OpCodes.Ldind_U4);
break;
case MetadataType.Single:
il.Emit(OpCodes.Ldind_R4);
break;
case MetadataType.Double:
il.Emit(OpCodes.Ldind_R8);
break;
case MetadataType.IntPtr:
case MetadataType.UIntPtr:
il.Emit(OpCodes.Ldind_I);
break;
default:
if (spec.ElementType.IsValueType)
{
il.Emit(Instruction.Create(OpCodes.Ldobj, spec.ElementType));
}
else
{
il.Emit(OpCodes.Ldind_Ref);
boxing = false;
}
break;
}
if (boxing)
{
il.Emit(Codes.Box(spec.ElementType));
}
}
else
{
il.Emit(Codes.Box(p.ParameterType));
}
il.Emit(Codes.StoreArray);
}
return(array);
}