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Title: bpo-32604: [_xxsubinterpreters] Propagate exceptions. by ericsnowcurrently · Pull Request #19768 · python/cpython · GitHub

Open Graph Title: bpo-32604: [_xxsubinterpreters] Propagate exceptions. by ericsnowcurrently · Pull Request #19768 · python/cpython

X Title: bpo-32604: [_xxsubinterpreters] Propagate exceptions. by ericsnowcurrently · Pull Request #19768 · python/cpython

Description: (Note: PEP 554 is not accepted and the implementation in the code base is a private one for use in the test suite.) If code running in a subinterpreter raises an uncaught exception then the "run" call in the calling interpreter fails. A RunFailedError is raised there that summarizes the original exception as a string. The actual exception type, __cause__, __context__, state, etc. are all discarded. This turned out to be functionally insufficient in practice. There is a more helpful solution (and PEP 554 has been updated appropriately). This change adds the exception propagation behavior described in PEP 554 to the _xxsubinterpreters module. With this change a copy of the original exception is set to __cause__ on the RunFailedError. For now we are using "pickle", which preserves the exception's state. We also preserve the original __cause__, __context__, and __traceback__ (since "pickle" does not preserve those). https://bugs.python.org/issue32604

Open Graph Description: (Note: PEP 554 is not accepted and the implementation in the code base is a private one for use in the test suite.) If code running in a subinterpreter raises an uncaught exception then the "r...

X Description: (Note: PEP 554 is not accepted and the implementation in the code base is a private one for use in the test suite.) If code running in a subinterpreter raises an uncaught exception then the &qu...

Opengraph URL: https://github.com/python/cpython/pull/19768

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bpo-32604: [_xxsubinterpreters] Propagate exceptions. https://github.com/python/cpython/pull/19768/files#top
Show all changes 16 commits https://github.com/python/cpython/pull/19768/files
3e4d56d Add tests for error propagation. ericsnowcurrently Apr 23, 2020 https://github.com/python/cpython/pull/19768/commits/3e4d56dfd8e571a981f29fe24660cbe5dda21c0b
f19008b Add string utils. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/f19008bef91c6c2427d9c1de677742bb3507b205
4709f0f Add object utils (incl. struct _objsnapshot). ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/4709f0fa4e36633bffdc680e6e698daa6beb1963
185788d Add structs _tbsnapshot and _excsnapshot. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/185788dc1128d66a1a7fe7aaddd67813daf77443
f94e5b4 Propagate exceptions using the new utils. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/f94e5b45ade7ffee1dc6a3c3655060ce1d3cc408
e3095be Factor out _sharedexception_get_cause() and _get_wrapper(). ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/e3095bec2e3d5b939e409859f3199b90c8e6a65f
f3d88c9 Factor out _pyexc_create(). ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/f3d88c9cfe59b368290c60c498378755ee4999c6
99a58f4 Factor out _pyexc_set_context(). ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/99a58f4fbe7ae4f6152b4a7cfac4b6db1ee66c57
40b092a Use _PyErr_ChainExceptions() to do chaining. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/40b092a1fe299417d8a907e4abac4b0f543ba121
5407cef Set __context__ manually. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/5407cefcdf98178c3fa820dd0925dd2e4ca93d22
d9ecbeb Drop _copy_raw_string(). ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/d9ecbeb925ed48c294b69cf409a1c8c996113bea
54594ba Fix RunStringTests. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/54594bad48efb97329400255a21964e04c5b13d9
a191c03 [tests] Check proper __traceback__. ericsnowcurrently Apr 27, 2020 https://github.com/python/cpython/pull/19768/commits/a191c030d68bda7ba820200eaa76c94d6c9a1dfb
6d9e383 Extract __traceback__ with the proper order. ericsnowcurrently Apr 28, 2020 https://github.com/python/cpython/pull/19768/commits/6d9e383b2f60eb36f5bbb991b22311fd92849606
adf4413 Fully pickle propagated exceptions. ericsnowcurrently Apr 28, 2020 https://github.com/python/cpython/pull/19768/commits/adf4413096b6bc4dc1f1a80fb4ceea397fd4143e
212ac0b Fix the "custom" exception tests. ericsnowcurrently Apr 28, 2020 https://github.com/python/cpython/pull/19768/commits/212ac0b72aac45c616e3c1c198ebe7f11b7a1bd3
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