[Bug python/21436] New: frame filter should allow duplicated underlying frames

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21436

            Bug ID: 21436
           Summary: frame filter should allow duplicated underlying frames
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Currently a frame filter must associate each frame it returns with
some underlying inferior frame.  If multiple decorated frames refer
to the same underlying frame, the resulting output from gdb is a bit
funny -- it prints the frame number (like "#5") just once, but otherwise
prints the entire frame multiple times (at each spot it is referenced).
(It's possible this only occurs when the frame is also elided -- I
can't recall right now.)

This problem came up while writing a frame filter that understands
SpiderMonkey interpreter frames.  See:

https://bugzilla.mozilla.org/show_bug.cgi?id=1254297

In SpiderMonkey, a given invocation of the interpreter loop may actually
evaluate several interpreted calls, so each such frame would refer
to the same underlying C++ frame.

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