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Title: [PEP 558 - WIP] bpo-30744: Trace hooks no longer reset closure state by ncoghlan · Pull Request #3640 · python/cpython · GitHub

Open Graph Title: [PEP 558 - WIP] bpo-30744: Trace hooks no longer reset closure state by ncoghlan · Pull Request #3640 · python/cpython

X Title: [PEP 558 - WIP] bpo-30744: Trace hooks no longer reset closure state by ncoghlan · Pull Request #3640 · python/cpython

Description: (Declined as per the PEP deferral notice in https://github.com/python/peps/pull/3050/files - this reference implementation was useful at the time, but after the frame management changes in Python 3.11 any implementation of the updated semantics in PEP 558 or PEP 667 would be best off starting from scratch. The test cases from this branch might still be useful, but those can always be copied out to a new branch easily enough) Previously, trace hooks running on a nested function could incorrectly reset the state of a closure cell. This avoids that by changing the semantics of the f_locals namespace on function frames to use a write-through proxy, such that changes are made immediately rather than being written back some arbitrary time later. PEP 558 and bpo-17960 cover additional changes to locals() and frame.f_locals semantics that are part of this update. Remaining TODO items before this PR could be considered complete: Resolve #27525 and resync this PR with the main branch Update PEP 558 to cover the performance improvements made to the proxy implementation (lazy initial cache refresh, share a single fast refs mapping between all proxy instances for a given frame) Merge in Python 3.11 frame implementation changes Fix fast locals proxy implementation to account for Python 3.11 frame implementation changes Fix fast locals proxy implementation to follow the design changes in python/peps#1787 Stop implicitly updating the local variable snapshot when running Python tracing functions Python API documentation updates for locals(), vars(), and potentially others (check all locals mentions) docstring updates for locals() (and potentially vars()) PyEval_* C API documentation updates PyFrame_* C API documentation updates Fix C API header layout to follow modern conventions (#18052) When rearranging headers, fix the clang warning/error about PyFrameObject redefinition Add refcount adjustment info for new C APIs Migrate eval() default locals namespace to PyLocals_Get() Migrate exec() default locals namespace to PyLocals_Get() Report an error if IMPORT_STAR opcode is encountered in a CO_OPTIMIZED frame Add an explicit test for the new PyFrame_LocalsToFast() runtime error Add explicit C API tests for PyLocals_Get() and PyEval_GetLocals() at different scopes Implement and test the other new PyLocals and PyFrame functions Implement and test the following methods on the fast locals proxy: setdefault() popitem() clear() update() (theoretically already implemented, but needs explicit tests) Add explicit tests for the behaviour of proxies that reference a cleared frame Desirable code structure improvements (current plan for these is to put any duplicated into a sharable location in this PR, but file separate maintainability issues to migrate to using the shared code in the original locations, to avoid the diff size impact on this PR): Deduplicate the mutable mapping code copied from odictobject.c Move the DictProxy code out of descrobject.c (obsolete task, as frame locals proxy is now independent of mapping proxy) https://bugs.python.org/issue30744

Open Graph Description: (Declined as per the PEP deferral notice in https://github.com/python/peps/pull/3050/files - this reference implementation was useful at the time, but after the frame management changes in Python 3...

X Description: (Declined as per the PEP deferral notice in https://github.com/python/peps/pull/3050/files - this reference implementation was useful at the time, but after the frame management changes in Python 3...

Opengraph URL: https://github.com/python/cpython/pull/3640

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[PEP 558 - WIP] bpo-30744: Trace hooks no longer reset closure state https://github.com/python/cpython/pull/3640/files#top
Show all changes 80 commits https://github.com/python/cpython/pull/3640/files
7626a0e bpo-30744: Trace hooks no longer reset closure state ncoghlan Sep 18, 2017 https://github.com/python/cpython/pull/3640/commits/7626a0e73fff2ea97cb33f09e53809e5d1c1e7fe
3cbb73c Disable the current broken writeback logic ncoghlan Nov 5, 2017 https://github.com/python/cpython/pull/3640/commits/3cbb73c8d3ec30434fc82a1e43537a324ac091fb
01f3f34 Failing test case for writeback functionality ncoghlan Nov 5, 2017 https://github.com/python/cpython/pull/3640/commits/01f3f34f9295fb5b8f7a52abe8e5b88497e62261
4f6dd93 Initial skeleton for a write-through proxy ncoghlan Nov 5, 2017 https://github.com/python/cpython/pull/3640/commits/4f6dd934e61ad9deb74944b9479d320a2f28f2e5
cd45da7 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Apr 21, 2019 https://github.com/python/cpython/pull/3640/commits/cd45da7f8133f132539a19381e2d7c8082b58218
acbf587 Finish adding the write-through proxy ncoghlan Apr 21, 2019 https://github.com/python/cpython/pull/3640/commits/acbf5876e8a7c9b3b9b7b82f17b9e9dee726df6c
d1a9014 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan May 21, 2019 https://github.com/python/cpython/pull/3640/commits/d1a9014fd14effcfc597c8ff97a11f3c6d539c10
5ea8bcf Add test case for the PEP 558 locals() behaviour ncoghlan May 22, 2019 https://github.com/python/cpython/pull/3640/commits/5ea8bcfb9192f35e9e421efd634651b14def0b1f
fe92891 Actually implement most of the PEP and fix the tests ncoghlan May 22, 2019 https://github.com/python/cpython/pull/3640/commits/fe928915d4c8fad7426ebcab33a115cf06252886
ac9e0bf Fix segfault on cleared frames ncoghlan May 27, 2019 https://github.com/python/cpython/pull/3640/commits/ac9e0bfc68cf24da77e35b9448f61eb5ba72f198
6774e71 Use correct printf formatting code ncoghlan May 27, 2019 https://github.com/python/cpython/pull/3640/commits/6774e71cf41de77860527d534c6c92b3b2716677
74c51e4 Initial skeleton for other mutable mapping methods ncoghlan May 28, 2019 https://github.com/python/cpython/pull/3640/commits/74c51e447e83746b11cf9996fe5eac285f019b8d
0e5fbf3 Break ref cycle when frame finishes executing ncoghlan May 30, 2019 https://github.com/python/cpython/pull/3640/commits/0e5fbf3fac82644a7ca6427007dabde27a370942
9e3ce53 Remove implicit frame locals update ncoghlan May 30, 2019 https://github.com/python/cpython/pull/3640/commits/9e3ce53a369f6946bff33b0e28bd90f13c1ca985
9479557 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan May 30, 2019 https://github.com/python/cpython/pull/3640/commits/94795571686cc83730c2defcd974694274554697
8e886ef Avoid double DECREF on error ncoghlan May 30, 2019 https://github.com/python/cpython/pull/3640/commits/8e886efb0d70689624fff8b10acd1425a313110a
5b63e7c Attempt to make dealloc more robust under gc ncoghlan May 30, 2019 https://github.com/python/cpython/pull/3640/commits/5b63e7cfe489c124ec4dcef3ba3fd1ca8027f099
f0ecee3 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/f0ecee3d3725f3979cbf231bcc70dc992e4a09e9
1752b54 Fix post-merge compilation errors ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/1752b5436f8d85f6048b766404937aa9d2142789
348a56d Implement flp.pop() ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/348a56d6e97b1142b1464cb0b7df9824f4670b1c
93f512c Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/93f512c29784ff7e0ad343d80b172a04a855a1fa
39ec4d8 Refactor ref map creation ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/39ec4d8c89205318bfc3cf1188efb29e48ae6301
7078632 Correctly manage fast local refcounts ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/7078632520279fd19ec59b8faec5ddd27ea4b64c
ed5f86e Allow closure updates after frame termination ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/ed5f86ee989ec2826553684181d901a869a33ede
a216747 Refactor frame post-eval cleanup ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/a216747a0122f8754c414768415806ea5701976c
a0dc787 Use full word in API name ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/a0dc787f3891fd58c133b50e9d18dbbb2a1a32ff
7b02bed Update to match latest PEP draft ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/7b02bedd8cf2d87e43114995d925cdffd745da06
e9876b5 Update test_scope for snapshot semantics ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/e9876b5d5e4b012b3172417c828d5cf765a937cd
0033c60 Update test_sys_settrace for snapshot semantics ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/0033c600591e028e7f9ed25dd0897f153087df36
a5a8b19 Fix pop/delete locals proxy bug ncoghlan Dec 29, 2019 https://github.com/python/cpython/pull/3640/commits/a5a8b1971f1c9b74b15d57d0d4348f291a073ed2
6c98f48 Update argument clinic output ncoghlan Dec 30, 2019 https://github.com/python/cpython/pull/3640/commits/6c98f48c8ba1018acea3aa4c6ac2028dd6a82aaf
617f6ab Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Dec 30, 2019 https://github.com/python/cpython/pull/3640/commits/617f6ab5c0aa915e3f39a733f77c632c2eb7025d
729f121 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Jan 18, 2020 https://github.com/python/cpython/pull/3640/commits/729f12159ccaa855eea18b7aeff3c19f7b915a81
619fb75 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Feb 2, 2020 https://github.com/python/cpython/pull/3640/commits/619fb75acc9e5a571d00a77a51c7ce8a71913dc4
1fe964e Migrate to revised public API design ncoghlan Feb 2, 2020 https://github.com/python/cpython/pull/3640/commits/1fe964ed7380c3362cfe99f1d3ce68bcffeaeef3
b047ae4 Rename PyFrame_LocalsIsSnapshot to PyFrame_GetLocalsReturnsSnapshot ncoghlan Feb 2, 2020 https://github.com/python/cpython/pull/3640/commits/b047ae4394cdf43f09b9e6db30c2d7c6781c786a
d1a8420 Mark fast locals proxy as an internal type ncoghlan Feb 2, 2020 https://github.com/python/cpython/pull/3640/commits/d1a8420577543e551bddffce2c3887230715d8d2
82108ff Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Feb 15, 2020 https://github.com/python/cpython/pull/3640/commits/82108fffea4d4e0960f2f38822cd62b82e0c32a8
eccb1ea Update draft C API to match latest PEP text ncoghlan Feb 16, 2020 https://github.com/python/cpython/pull/3640/commits/eccb1ea3b3ddca6c12747382718f297a12596149
c1933e7 Migrate exec() and eval() to PyLocals_Get() ncoghlan Feb 16, 2020 https://github.com/python/cpython/pull/3640/commits/c1933e744f7d5b1d3489d3588267178b94851ab9
161ad47 Merge remote-tracking branch 'origin/master' into bpo-30744-make-loca… ncoghlan Feb 22, 2020 https://github.com/python/cpython/pull/3640/commits/161ad47576e1ec772bdb1bbdd30f6edfb096530f
68f10ce Avoid circular reference between locals proxy and frame ncoghlan Feb 22, 2020 https://github.com/python/cpython/pull/3640/commits/68f10ced11a24166269cef8416bb98715d9bd200
29ce344 Add back implicit view refresh in Python trace hook ncoghlan Feb 22, 2020 https://github.com/python/cpython/pull/3640/commits/29ce344d55c502a08481987e5ff0cc749ead7946
ed6e53b Attempt to tidy up Mac OS X compile warnings/errors ncoghlan Feb 22, 2020 https://github.com/python/cpython/pull/3640/commits/ed6e53be7794ec94924b69cd46d5b009633c6307
96c77cb Merge remote-tracking branch 'origin/main' into bpo-30744-make-locals… ncoghlan Jul 3, 2021 https://github.com/python/cpython/pull/3640/commits/96c77cb4eff511fccb08d2f504a48ca920b3dbd6
a348d08 Fix Argument Clinic checksum ncoghlan Jul 3, 2021 https://github.com/python/cpython/pull/3640/commits/a348d086c447a77860da8b17c79815bff6da2291
69c8f19 Fix stable ABI minimum version ncoghlan Jul 3, 2021 https://github.com/python/cpython/pull/3640/commits/69c8f19742d8a8e083d11c568d512d6668c3b1a1
caeaf66 Bring implementation into line with latest PEP version ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/caeaf667a72e020b623dc1dc12564dc05be6b74b
7ec5d26 Register new stable ABI additions ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/7ec5d26622088840240f20276016f15d05a16050
7ddc3eb Add FLP str(), fix various value lookup issues ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/7ddc3ebaf15f024e5ecef83c0ce6265b98bc7f1a
7400a46 Uninitialised fields will get you every time ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/7400a4608e3704c9e56f6b6c10cec3da15b05ee5
5eae0d5 Fix refcounting, bdb segfault, pdb functionality ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/5eae0d52fd743c8e28613346fc76f0a895f1b26f
40db4e7 Delegate more operations to the full dynamic snapshot ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/40db4e7d387261aaa9037b03546ece89401d5ee8
74b97a3 Add TODO item for false positives in containment checks ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/74b97a3ef39a5e67c019858f8d60a033401dee64
9f16513 Only ensure frame snapshot is up to date in O(n) proxy operations ncoghlan Jul 10, 2021 https://github.com/python/cpython/pull/3640/commits/9f16513a919c3d2ad7e6ead6298d0cb590caf1a3
c477e24 Keep locals snapshot up to date when reading/writing individual keys ncoghlan Jul 11, 2021 https://github.com/python/cpython/pull/3640/commits/c477e2432c2d8c6c938340c230da7da520b31d8b
dd94608 Avoid false positives in FLP contains method ncoghlan Jul 11, 2021 https://github.com/python/cpython/pull/3640/commits/dd946084ea5aaacc9961554bcddf475e9fe5a861
b7eb662 Merge remote-tracking branch 'origin/main' into bpo-30744-make-locals… ncoghlan Jul 17, 2021 https://github.com/python/cpython/pull/3640/commits/b7eb6627dd759cfab4960a8e28386bc2a0667aed
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