[patch] Fix PR python/10646. Add libstdc++ Python pretty-printers for -D_GLIBCXX_DEBUG cases.

[Phil Muldoon]

http://sourceware.org/bugzilla/show_bug.cgi?id=10646

This patch adds Python pretty-printer support for the debug variants of 
various STL classes when the inferior is compiled with 
-D_GLIBCXX_DEBUG.  There are four attachments.  The first is the patch, 
the second is the test .cpp program; the third and fourth are the 
pretty-printer output files from the "normal" compilation, and the 
-D_GLIBCXX_DEBUG enabled compilation from within GDB.  The two output 
forms, and the test program are submitted as supporting documentation 
and are not part of the overall patch.

I compiled the binaries as follows:

g++ -g3 -O0 -std=c++0x -D_GLIBCXX_DEBUG printer-test.cpp -o printer-test-dbg

and

g++ -g3 -O0 -std=c++0x printer-test.cpp -o printer-test

I then run each binary through a Python enabled GDB as follows:

/home/build/obj/gdb/gdb --quiet -ex "set verbose off" -ex "set 
pagination off" -ex "set confirm no" -ex "source printers.py" -ex 
"python gdb.pretty_printers = [lookup_function]" -ex "break 198" -ex 
"run" -ex "info locals" -ex "quit" --args printer-test-dbg > debug.out

/home/build/obj/gdb/gdb --quiet -ex "set verbose off" -ex "set 
pagination off" -ex "set confirm no" -ex "source printers.py" -ex 
"python gdb.pretty_printers = [lookup_function]" -ex "break 198" -ex 
"run" -ex "info locals" -ex "quit" --args printer-test > normal.out

The output from the -D_GLIBCXX_DEBUG enabled binary should now match the 
output from the binary compiled without it.

Note that some of the classes do not have debug variants and are not 
included in this patch.  These are mainly the TR1,   __gnu_cxx::slist 
and   __gnu_cxx::slist iterator, shared, weak and unique pointer 
classes.  Some of the debug variant iterators are wrapped in the 
encapsulating "__gnu_debug::_Safe_iterator" and are renamed, and some 
are just wrapped and not renamed with the __norm namespace.  Some of the 
iterators have implementation details that required some small changes 
in the actual iterator printers.

Where appropriate, this patch now writes the class name for the given 
class as it was passed in via the printer, instead of returning a fixed 
string.

OK?

Regards

Phil

ChangeLog:

2009-09-30  Phil Muldoon <pmuldoon@redhat.com>

     PR python/10646

     * python/libstdcxx/v6/printers.py (StdListPrinter):
     Add -D_GLIBCXX_DEBUG implementation changes. Receive typename from
     printer registration.
     (StdListIteratorPrinter): Likewise.
     (StdDebugIteratorPrinter): New printer.
     (build_libstdcxx_dictionary): Add -D_GLIBCXX_DEBUG registration
     entries.  Always pass a typename where the type can change.
     (StdSlistPrinter) Receive typename from printer registration.  Use
     in printer output.
     (StdBitsetPrinter): Likewise.
     (StdDequePrinter): Likewise.

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