RFR(S): 8211852: inspect stack during error reporting

[Doerr, Martin]

Hi,

after making os::print_location more reliable, I'd like to use it to inspect the top of the stack, too (in a dedicated step).

We already inspect the registers during error reporting, but some important pointers may be only on stack, especially on architectures which don't have so many registers.
Since hs_err files are often all we get after a crash, it is often valuable to spend a little space for more information about what's referenced on top of the stack.

I've uploaded my proposal here:
http://cr.openjdk.java.net/~mdoerr/8211852_stack_info/webrev.00/

I had thought about using print_location in the platform specific code (print_context), but I think using a dedicated step is better. Especially if print_location doesn't work we'll still get the dump of the context which contains a piece of the stack as hex dump without any further inspection.

Please review.

Best regards,
Martin