This PR combines the "open" and "closed" regions of the CDS archive heap into a single region. This significantly simplifies the implementation, making it more compatible with non-G1 collectors. There's a net removal of ~1000 lines in src code and another ~1200 lines of tests.
**Notes for reviewers:** - Most of the code changes in CDS are removing the handling of "open" vs "closed" objects. - Reviewers can start with ArchiveHeapWriter::copy_source_objs_to_buffer(). - It might be easier to see the diff with whitespaces off. - There are two major changes in the G1 code - The archived objects are now stored in the "old" region (see g1CollectedHeap.cpp in [58d720e](https://github.com/openjdk/jdk/pull/13284/commits/58d720e294bb36f21cb88cddde724ed2b9e93770)) - The majority of the other changes are removal of the "archive" region type (see heapRegionType.hpp). For ease of review, such code is isolated in [a852dfb](https://github.com/openjdk/jdk/pull/13284/commits/a852dfbbf5ff56e035399f7cc3704f29e76697f6) - Testing changes: - Now the archived java objects can move, along with the "old" regions that contain them. It's no longer possible to test whether a heap object came from CDS. As a result, the `WhiteBox.isShared(Object o)` API has been removed. - Many tests that uses this API are removed. Most of them were written during early development of CDS archived objects and are no longer relevant. **Testing:** - Mach5 tiers 1 ~ 7 ------------- Commit messages: - Remove archive region types from G1 - clean up (1) - 8298048: Combine CDS archive heap into a single block Changes: https://git.openjdk.org/jdk/pull/13284/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13284&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8298048 Stats: 2995 lines in 75 files changed: 110 ins; 2271 del; 614 mod Patch: https://git.openjdk.org/jdk/pull/13284.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13284/head:pull/13284 PR: https://git.openjdk.org/jdk/pull/13284
