[RFA] JDWP single step callback

[Keith Seitz]

Okay, at long, last, here is *the* patch. My last outstanding JVMTI/JDWP
patch that implements the meat of the single step notification.

I don't think I need to comment too much about it: I've put a rather
substantial number of comments in the code to help explain what it does.
I actually found implementing single stepping a whole lot easier than
I expected. It's *so* much simpler when one does not have to worry about
different architectures. [nod to gdb] :-)

Questions/comments/concerns?

Keith

ChangeLog
2007-02-13  Keith Seitz  <keiths@redhat.com>

         * gnu/classpath/jdwp/natVMVirtualMachine.cc
         (get_line_table): New function.
         (handle_single_step): New function.
         (jdwpSingleStepCB): New function.
         (jdwpVMInitCB): Define a JVMTI single step
         callback, but don't enable it until needed.

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