On Fri, 10 May 2024 13:24:53 GMT, Chen Liang <li...@openjdk.org> wrote:
>> This is the implementation changes for JEP 471. >> >> The methods in sun.misc.Unsafe for on-heap and off-heap access are >> deprecated for removal. This means a removal warning at compile time. No >> methods have been removed. A deprecated message is added to each of the >> methods but unlikely to be seen as the JDK does not generate or publish the >> API docs for this class. >> >> A new command line option --sun-misc-unsafe-memory-access=$value is >> introduced to allow or deny access to these methods. The default proposed >> for JDK 23 is "allow" so no change in behavior compared to JDK 22 or >> previous releases. >> >> A new test is added to test the command line option settings. The existing >> micros for FFM that use Unsafe are updated to suppress the removal warning >> at compile time. A new micro is introduced with a small sample of methods to >> ensure the changes doesn't cause any perf regressions. >> >> For now, the changes include the update to the man page for the "java" >> command. It might be that this has to be separated out so that it goes with >> other updates in the release. > > Should `Unsafe.pageSize` be deprecated for removal too? @liach > Should `Unsafe.pageSize` be deprecated for removal too? The three remaining methods `Unsafe::pageSize()`, `Unsafe::throwException(Throwable)`, and `Unsafe::allocateInstance(Class)` are left for future JEPs: - https://openjdk.org/jeps/471#Future-Work ------------- PR Comment: https://git.openjdk.org/jdk/pull/19174#issuecomment-2105400547
