python-gdb: display wrapper_call()

[vstinner]

BPO	29367
Nosy	@vstinner, @methane
PRs	[Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552 [2.7] bpo-32962: Backport python-gdb.py and test_gdb.py from master (GH-7710) #7726
Files	gdb_wrapper_call.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-02-01.16:00:50.469>
created_at = <Date 2017-01-25.09:29:36.407>
labels = ['type-feature', '3.7']
title = 'python-gdb: display wrapper_call()'
updated_at = <Date 2018-06-15.21:59:59.588>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-06-15.21:59:59.588>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-02-01.16:00:50.469>
closer = 'python-dev'
components = []
creation = <Date 2017-01-25.09:29:36.407>
creator = 'vstinner'
dependencies = []
files = ['46411']
hgrepos = []
issue_num = 29367
keywords = ['patch']
message_count = 9.0
messages = ['286233', '286638', '286640', '286641', '286655', '286665', '286671', '293584', '319680']
nosy_count = 3.0
nosy_names = ['vstinner', 'methane', 'python-dev']
pr_nums = ['552', '7726']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29367'
versions = ['Python 3.7']

[vstinner]

python-gdb.py handles various Python calls, but not descriptors. Attached patch adds code to display calls to wrapperobject objects.

The patch adds the first "<method-wrapper ...>" line of the traceback:
---

(gdb) py-bt
Traceback (most recent call first):
  <method-wrapper '__init__' of CodecInfo object at 0x7ffff7e9d7a8>
  File "/home/haypo/prog/python/git_cpython/Lib/encodings/utf_8.py", line 41, in getregentry
    streamwriter=StreamWriter,
  File "/home/haypo/prog/python/git_cpython/Lib/encodings/__init__.py", line 122, in search_function
    entry = getregentry()

---

I wrote this patch while working on the issue bpo-29358. Object instanciation is full of wrappers. A better debugger helps to me understand my bugs ;-)

Example to get such tracecback:
---

haypo@selma$ gdb -args ./python -m test -v test_sys
(gdb) b wrapper_call
(gdb) run
(gdb) py-bt
Traceback (most recent call first):
  <method-wrapper '__init__' of _EnumDict object at 0x7ffff023d388>
  File "/home/haypo/prog/python/default/Lib/enum.py", line 66, in __init__
    super().__init__()
  File "/home/haypo/prog/python/default/Lib/enum.py", line 117, in __prepare__
    enum_dict = _EnumDict()
  <built-in method __build_class__ of module object at remote 0x7ffff7f46c58>
  File "/home/haypo/prog/python/default/Lib/enum.py", line 509, in <module>
    class Enum(metaclass=EnumMeta):
  <built-in method exec of module object at remote 0x7ffff7f46c58>
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  (...)

---

I guess that the next step is to write a test ;-)

[python-dev]

New changeset 54fa95b19fae by Victor Stinner in branch 'default':
python-gdb.py supports method-wrapper
https://hg.python.org/cpython/rev/54fa95b19fae

[python-dev]

New changeset ffd2e5f9256a by Victor Stinner in branch 'default':
Make test_gdb.test_wrapper_call() make reliable
https://hg.python.org/cpython/rev/ffd2e5f9256a

[python-dev]

New changeset efaf32ac89ec by Victor Stinner in branch 'default':
Fix test_gdb.test_wrapper_call() on Python 2
https://hg.python.org/cpython/rev/efaf32ac89ec

[vstinner]

New changeset d05f7fd by Victor Stinner in branch '3.6':
[3.6] bpo-30345: Update test_gdb.py and python-gdb.py from master (bpo-1549)
d05f7fd

[vstinner]

New changeset e36f94f by Victor Stinner in branch '2.7':
bpo-32962: Backport python-gdb.py and test_gdb.py from master (GH-7726)
e36f94f

[python-dev]

New changeset 30867b703933d6ba30bc5f609a1a2337925ead33 by Victor Stinner in branch 'master':
python-gdb.py supports method-wrapper
30867b7

[python-dev]

New changeset 88835e6022a81d8107a296c9f6e5f16c7d39e27a by Victor Stinner in branch 'master':
Make test_gdb.test_wrapper_call() make reliable
88835e6

[python-dev]

New changeset da331c7d12c4648b9734ebb07e9f722c8478d269 by Victor Stinner in branch 'master':
Fix test_gdb.test_wrapper_call() on Python 2
da331c7