We saw the failure in serviceability/sa/TestJhsdbJstackMixedWithXComp.java on
Valhalla repo. `jhsdb jstack --mixed` could not unwind continuation call frames
as following:
* LingeredAppWithVirtualThread.run() bci:15 line:69
(Interpreted frame)
* java.lang.Thread.runWith(java.lang.Object,
java.lang.Runnable) bci:5 line:1540 (Compiled frame [deoptimized]; information
may be imprecise)
* java.lang.VirtualThread.run(java.lang.Runnable) bci:62
line:472 (Compiled frame [deoptimized]; information may be imprecise)
0x00007fdad773cf98 <StubRoutines (continuation stubs)>
0xfefefefefefefefe ????????
I found that `frame::sender_for_compiled_frame()` in frame_x86.inline.hpp has a
special case if sender PC has return barrier entry, but SA does not handle it.
This is not only a problem on Valhalla. Same problem exists on JDK. So I want
to fix on JDK.
This PR passed serviceability/sa tests on Linux, and also
TestJhsdbJstackMixedWithXComp.java on Valhalla passed 100 times.
This PR is assembled by following commits:
* Follows continuation-related code in HotSpot, and use it on AMD64 SA code
*
https://github.com/openjdk/jdk/pull/30107/changes/4af559ee0dbc0bb61e0bcd91bb17459a5abf50ad
* Fix for AArch64
*
https://github.com/openjdk/jdk/pull/30107/changes/2cff0fe40c52b88dd8d79ad1534e73b7b0f88f8d
* Fix for RISC-V
*
https://github.com/openjdk/jdk/pull/30107/changes/fdef0384577bb71d34371f11bc5878494f276857
* Fix for PPC64
*
https://github.com/openjdk/jdk/pull/30107/changes/5d9774d82c7e8c4d92eae8995ab014232ce9590e
-------------
Commit messages:
- Use create() to instantiate parent instance
- Fix for PPC64
- Fix for RISC-V
- Fix for AArch64
- Implement Continuation.continuationBottomSender
Changes: https://git.openjdk.org/jdk/pull/30107/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30107&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8378985
Stats: 457 lines in 15 files changed: 401 ins; 44 del; 12 mod
Patch: https://git.openjdk.org/jdk/pull/30107.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/30107/head:pull/30107
PR: https://git.openjdk.org/jdk/pull/30107
