//
// This is a port of InvokeUtil::CanPrimitiveWiden() in the desktop runtime. This is used by various apis such as Array.SetValue()
// and Delegate.DynamicInvoke() which allow value-preserving widenings from one primitive type to another.
//
public bool CanWidenTo(RuntimeImports.RhCorElementType targetElementType)
{
// Caller expected to ensure that both sides are primitive before calling us.
Debug.Assert(this.IsPrimitive);
Debug.Assert(GetRhCorElementTypeInfo(targetElementType).IsPrimitive);
// Once we've asserted that the target is a primitive, we can also assert that it is >= ET_BOOLEAN.
Debug.Assert(targetElementType >= RuntimeImports.RhCorElementType.ELEMENT_TYPE_BOOLEAN);
byte targetElementTypeAsByte = (byte)targetElementType;
ushort mask = (ushort)(1 << targetElementTypeAsByte); // This is expected to overflow on larger ET_I and ET_U - this is ok and anticipated.
if (0 != (_widenMask & mask))
return true;
return false;
}
internal static RhCorElementTypeInfo GetRhCorElementTypeInfo(RuntimeImports.RhCorElementType elementType)
{
// The _lookupTable array only covers a subset of RhCorElementTypes, so we return a default
// info when someone asks for an elementType which does not have an entry in the table.
if ((int)elementType > s_lookupTable.Length)
return default(RhCorElementTypeInfo);
return s_lookupTable[(int)elementType];
}
internal static RhCorElementTypeInfo GetRhCorElementTypeInfo(RuntimeImports.RhCorElementType elementType)
{
return RhCorElementTypeInfo.GetRhCorElementTypeInfo(elementType);
}