> 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 ([sample > results](https://cr.openjdk.org/~alanb/8331670-results.txt)). > > 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.
Alan Bateman has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 10 commits: - Merge - Add removal to DISABLED_WARNINGS Fail at startup if bad value specified to option - Merge - Update man page - Update man page - Fix comment - Merge - Merge - Whitespace - Initial commit ------------- Changes: https://git.openjdk.org/jdk/pull/19174/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19174&range=02 Stats: 1234 lines in 8 files changed: 1150 ins; 5 del; 79 mod Patch: https://git.openjdk.org/jdk/pull/19174.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/19174/head:pull/19174 PR: https://git.openjdk.org/jdk/pull/19174
