[Bug c++/10008] New: Modify Python value pretty-printers to search for a C++ base class printer, if a specialised one does not exist.

["pmuldoon at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

This is not so much a bug as a missing feature. Right now if there is a printer
for std::map, but you have the derived class:

Class Foo : public std::map

the printer will not pretty-print Foo. In this case Foo is just an uncomplicated
derived class of std::map. There is no reason why the std::map information in
that class cannot be pretty-printed. 

Each python printer can special case this by searching for the base class
information in the fields attribute of the value. But this would require every
C++ Python printer to account for this.

After the initial Python value -> printer search and failure, GDB will fall-back
to its own internalised pretty-printer logic. There is another chance here to
attempt to inject Python pretty printers over GDB internalised pretty-printers.
As GDB strips away to the base-class, there is an opportunity to re-run the
printer search to check if there is a printer for that base class. We should add
logic to this code to rerun the search against the base-class, with the value
type being reported as the base class.

-- 
           Summary: Modify Python value pretty-printers to search for a C++
                    base class printer, if a specialised one does not exist.
           Product: gdb
           Version: archer
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: pmuldoon at redhat dot com
        ReportedBy: pmuldoon at redhat dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=10008

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