gh-156133: Add PyUnstable_InterpreterFrame_GetLocals - #156134
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Add an unstable C API that returns a strong reference to a single local variable of an internal interpreter frame, addressed by its localsplus index, with cell and free variables unboxed to their contents. Free variables are resolved from the function closure, so the API also works on a frame that has not started executing (before COPY_FREE_VARS runs) -- the case that motivated it -- and it does not modify the frame. Includes the PEP 689 deliverables: reference documentation in Doc/c-api/frame.rst, a What's New entry for 3.16, a Misc/NEWS.d blurb, and tests in Lib/test/test_capi/test_misc.py (TestInternalFrameApi) covering plain locals, a cell variable, and a free variable. Authored with the assistance of an AI coding agent (Claude Opus)
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Add an unstable C API that reads a frame's local variables into a caller-provided array indexed by localsplus index, with cell and free variables unboxed to their contents. Free variables are resolved from the function closure, so the API also works on a frame that has not started executing (before COPY_FREE_VARS runs), which is the case that motivated it.
Includes the three PEP 689 deliverables:
Modules/_testinternalcapi.cdriven byLib/test/test_capi/test_frame_getlocals.pycovering plain locals, a cell variable, and a free variable).Authored with the assistance of an AI coding agent (Claude Opus)
PyUnstable_InterpreterFrame_GetLocalto read a local var from an interp. frame #156133