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bpo-42197: Don't create f_locals dictionary unless we actually need it. (GH-32055)

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* `PyFrame_FastToLocalsWithError` and `PyFrame_LocalsToFast` are no longer called during profile and tracing.
 (Contributed by Fabio Zadrozny)

* Make accesses to a frame's `f_locals` safe from C code, not relying on calls to `PyFrame_FastToLocals` or `PyFrame_LocalsToFast`.

* Document new `PyFrame_GetLocals` C-API function.
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Mark Shannon 2022-03-25 12:57:50 +00:00 • committed by GitHub
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7 changed files with 46 additions and 10 deletions
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Include/cpython/frameobject.h
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@ -23,3 +23,4 @@ PyAPI_FUNC(int) PyFrame_FastToLocalsWithError(PyFrameObject *f);
PyAPI_FUNC(void) PyFrame_FastToLocals(PyFrameObject *);
PyAPI_FUNC(PyFrameObject *) PyFrame_GetBack(PyFrameObject *frame);
PyAPI_FUNC(PyObject *) PyFrame_GetLocals(PyFrameObject *frame);