RFR: 8234624: jstack mixed mode should refer DWARF

[Yasumasa Suenaga]

Hi all,

Please review this change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8234624
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8234624/webrev.00/


According to 2.7 Stack Unwind Algorithm in System V Application Binary Interface AMD64
Architecture Processor Supplement [1], we need to use DWARF in .eh_frame or .debug_frame
for stack unwinding.

As JDK-8022183 said, omit-frame-pointer is enabled by default since GCC 4.6, so system
library (e.g. libc) might be compiled with this feature.

However `jhsdb jstack --mixed` does not do so, it uses base pointer register (RBP).
So it might be lack of stack frames.

I guess JDK-8219201 is caused by same issue.


Thanks,

Yasumasa


[1] https://software.intel.com/sites/default/files/article/402129/mpx-linux64-abi.pdf