> This is a cleanup of the memory session implementation. The main new concept > is that `MemorySessionImpl` is split into two parts: there is an > implementation of memory session and then there is a state abstraction > (`MemorySessionImpl.State`). This allows to share the state across multiple > session views, in a more clean way. The big consequence of this change is > that the routines on `ScopedMemoryAccess` now have to be defined in terms of > the state abstraction (but the changes are mostly mechanical). > > I have consolidated the implementation quite a bit, by removing all the > duplicated logic for issuing similar-looking exceptions. I have also > addressed an issue with `checkValidState` throwing a _new_ > `WrongThreadException` instead of using a singleton (which is what the logic > for closing down shared session requires, to avoid stack walks that are too > deep). > > `MemorySession.State::checkValidState` is now fully monomorphic; when looking > at benchmarks, this seems to be the best solution in order to make things > fast. Specializing implmentations to remove few plain checks does not buy > enough, and always has the risk of adding profile pollution.
Maurizio Cimadamore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits: - Merge branch 'master' into cleanup_memory_session_impl_state - Add null check on Buffer::checkState - Add docs Simplify liveness check in Buffer Drop redundant import in DirectBuffer - Simplify checkValidState - Add fastpath for implicit session state - Merge branch 'master' into cleanup_memory_session_impl_keep_list - Fix asNonCloseable to return self Improve direct buffer code with isImplicit predicate - Drop MemorySession interface type from AbstractMemorySessionImpl - Simplify code by removing intermediate getUnsafeBase/getUnsafeOffset methods - Simplify readOnly check - ... and 4 more: https://git.openjdk.java.net/jdk/compare/8d28734e...5b8f7246 ------------- Changes: https://git.openjdk.java.net/jdk/pull/9017/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9017&range=01 Stats: 1752 lines in 39 files changed: 407 ins; 525 del; 820 mod Patch: https://git.openjdk.java.net/jdk/pull/9017.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/9017/head:pull/9017 PR: https://git.openjdk.java.net/jdk/pull/9017
