Calls to the method are replaced with address arithmetic. The possible signatures are
IntType addressOfFieldName([IntType index]);
The return type must be a primitive integer type or a
word type. The receiver is
the pointer to the struct that is accessed
The field offset, i.e., the value that is added to the receiver, is a compile time constant.
The optional parameter
index denotes an index, i.e., the receiver is treated as an array
of the struct. The type must be a primitive integer type or a
word type. Address
arithmetic is used to scale the index with the size of the struct.