Stack unwinder for SA

[Yasumasa Suenaga]

Hi all,

Chris and I discussed about fixing JDK-8245234 to see all mixed stacks via `jhsdb jstack --mixed`.
In the discussion, we agree to use stack unwinder, but we haven't yet decided which library to use.
Can you suggest the stack unwinder for SA?

I fixed similar issue in JDK-8234624 to understand DWARF in SA for Linux, however it does not support DWARF completely because it is too complex to implement by scratch.
AMD64 SysV ABI [1] says DWARF is used for stack unwinding. So we need to support DWARF completely if we want to unwind.

There are some stack unwinder. I think libunwind [2] is suitable for this purpose, however I'm not sure it is the best solution.
And also I saw similar issue on Windows because we cannot depend on base pointer (like SA) in Windows x64 [3]. So I want to use the library which is support both Linux and Windows.

We also think introducing stack unwinder helps improving native call stacks in hs_err log. It will help troubleshooters.


I want to hear your opinions!


Thanks,

Yasumasa


[1] https://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdf
[2] https://github.com/libunwind/libunwind
[3] https://docs.microsoft.com/en-us/cpp/build/exception-handling-x64#unwind-procedure