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bpo-32043: New "developer mode": "-X dev" option (#4413)

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Add a new "developer mode": new "-X dev" command line option to
enable debug checks at runtime.

Changes:

* Add unit tests for -X dev
* test_cmd_line: replace test.support with support.
* Fix _PyRuntimeState_Fini(): Use the same memory allocator
   than _PyRuntimeState_Init().
* Fix _PyMem_GetDefaultRawAllocator()
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Victor Stinner 2017-11-16 03:20:31 -08:00 • committed by GitHub
parent 05cb728d68
commit ccb0442a33
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14
Doc/using/cmdline.rst
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@ -413,6 +413,17 @@ Miscellaneous options
nested imports). Note that its output may be broken in multi-threaded
application. Typical usage is ``python3 -X importtime -c 'import
asyncio'``. See also :envvar:`PYTHONPROFILEIMPORTTIME`.
* ``-X dev`` enables the "developer mode": enable debug checks at runtime.
In short, ``python3 -X dev ...`` behaves as ``PYTHONMALLOC=debug python3
-W default -X faulthandler ...``, except that the :envvar:`PYTHONMALLOC`
environment variable is not set in practice. Developer mode:
* Add ``default`` warnings option. For example, display
:exc:`DeprecationWarning` and :exc:`ResourceWarning` warnings.
* Install debug hooks on memory allocators as if :envvar:`PYTHONMALLOC`
is set to ``debug``.
* Enable the :mod:`faulthandler` module to dump the Python traceback
on a crash.
It also allows passing arbitrary values and retrieving them through the
:data:`sys._xoptions` dictionary.
@ -430,7 +441,8 @@ Miscellaneous options
The ``-X showalloccount`` option.
.. versionadded:: 3.7
The ``-X importtime`` and :envvar:`PYTHONPROFILEIMPORTTIME` options.
The ``-X importtime``, ``-X dev`` and :envvar:`PYTHONPROFILEIMPORTTIME`
options.
Options you shouldn't use