On 4/1/20 7:26 AM, Alan Bateman wrote:
Maybe I missed it going by, but why is the isHidden check in the field offset methods on sun.misc.Unsafe rather than the internal Unsafe?
The reflection and VarHandle implementation uses jdk.internal.misc.Unsafe to do field access (both read and write). For fields of a hidden declaring class, Field::get works on final and non-final fields. Field::set will work on non-final fields and throw IAE on final fields. That's why no change to the internal Unsafe to support reflective field access.
The check in the field offset methods in `sun.misc.Unsafe` intends to constrain the existing use of jdk.unsupported unsafe field offset methods to existing classes but not hidden classes (perhaps same to apply to inline classes) moving toward "trusted non-instance finals".
Mandy
