private static Pointer <byte> AddressOfHeapInternal <T>(T value, OffsetOptions offset)
{
// It is already assumed value is a class type
//var tr = __makeref(value);
//var heapPtr = **(IntPtr**) (&tr);
var heapPtr = AddressOf(ref value).ReadPointer();
// NOTE:
// Strings have their data offset by Offsets.OffsetToStringData
// Arrays have their data offset by IntPtr.Size * 2 bytes (may be different for 32 bit)
switch (offset)
{
case OffsetOptions.STRING_DATA:
{
Conditions.Require(RuntimeInfo.IsString(value));
string s = value as string;
return(heapPtr + Offsets.OffsetToStringData);
}
case OffsetOptions.ARRAY_DATA:
{
Conditions.Require(RuntimeInfo.IsArray(value));
return(heapPtr + Offsets.OffsetToArrayData);
}
case OffsetOptions.FIELDS:
{
// todo: if the type is an array, should this return ArrayData, ...and if it's a string,
// ... should this return StringData?
// Skip over the MethodTable*
return(heapPtr + Offsets.OffsetToData);
}
case OffsetOptions.NONE:
return(heapPtr);
case OffsetOptions.HEADER:
return(heapPtr - Offsets.OffsetToData);
default:
throw new ArgumentOutOfRangeException(nameof(offset), offset, null);
}
}