The issue #27350 changed the design of Python dictionaries to make them compact. python-gdb.py must be updated for the new structure of Python dict.

New changeset 0bd618fe0639 by Victor Stinner in branch 'default':
Implement compact dict
https://hg.python.org/cpython/rev/0bd618fe0639

I've fixed dict support of python-gdb.py.

But I found py-bt and py-bt-full are broken.  They doesn't show builtin method.
I think it's because FASTCALL.  But I'm not sure.
I just skip the test for py-bt in attached patch.

Could someone review this before 3.6b2?
Without this patch, python-gdb.py causes many RuntimeError.

@haypo, would you review this patch?

ping

I reviewed dict_gdb.patch.

dict_gdb2.patch LGTM. Can you please follow Ned's instructions to get this change merged into 3.6 final? python-gdb.py is an important tool and it's completly broken. The patch cannot make python-gdb.py worse :-D (More seriously, it fixes python-gdb.py.)

https://mail.python.org/pipermail/python-committers/2016-November/004065.html
> The 3.6 branch in the cpython repo is now available again but, as noted, *only* for reviewed release critical fixes appropriate for the 3.6.0 final and for final 3.6.0 doc updates!

So now I think I can commit this for now.

New changeset 4f6fb9e47f6b by INADA Naoki in branch '3.6':
Issue #28023: Fix python-gdb.py didn't support new dict implementation
https://hg.python.org/cpython/rev/4f6fb9e47f6b

New changeset c51045920410 by INADA Naoki in branch 'default':
Issue #28023: Fix python-gdb.py didn't support new dict implementation
https://hg.python.org/cpython/rev/c51045920410

test_gdb failed on a lot of buildbots. Examples:

* http://buildbot.python.org/all/builders/PPC64%20Fedora%203.x/builds/2089
* http://buildbot.python.org/all/builders/AMD64%20Debian%20PGO%203.6/builds/330
* http://buildbot.python.org/all/builders/x86%20Gentoo%20Non-Debug%20with%20X%203.6/builds/287

Extract of the Gentoo non-debug:

(...)
    GNU gdb (Gentoo 7.10.1 vanilla) 7.10.1
(...)
======================================================================
FAIL: test_NULL_ob_type (test.test_gdb.PrettyPrintTests)
Ensure that a PyObject* with NULL ob_type is handled gracefully
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/buildbot/buildarea/3.6.ware-gentoo-x86.nondebug/build/Lib/test/test_gdb.py", line 490, in test_NULL_ob_type
    'set v->ob_type=0')
  File "/buildbot/buildarea/3.6.ware-gentoo-x86.nondebug/build/Lib/test/test_gdb.py", line 461, in assertSane
    cmds_after_breakpoint=cmds_after_breakpoint)
  File "/buildbot/buildarea/3.6.ware-gentoo-x86.nondebug/build/Lib/test/test_gdb.py", line 240, in get_gdb_repr
    import_site=import_site)
  File "/buildbot/buildarea/3.6.ware-gentoo-x86.nondebug/build/Lib/test/test_gdb.py", line 218, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ["Python Exception <class 'gdb.error'> Can[663 chars].: "] != []

First list contains 10 additional elements.
First extra element 0:
"Python Exception <class 'gdb.error'> Cannot convert value to int.: "

Diff is 745 characters long. Set self.maxDiff to None to see it.

New changeset 9b974f988c95 by Victor Stinner in branch '3.6':
Issue #28023: Fix python-gdb.py on old GDB versions
https://hg.python.org/cpython/rev/9b974f988c95

Thanks a lot!

I hope I can run test on multiple environment before merge,
after we move to Github.

Ah nice, it seems like test_gdb pass again.

Thanks Naoki for the fix ;-) gdb scripts are a little bit weird sometimes, and the API has subtle changes in each minor GDB release :-/