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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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Doc/whatsnew/3.11.rst
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@ -969,7 +969,7 @@ Porting to Python 3.11
Code using ``f_lasti`` with ``PyCode_Addr2Line()`` must use
:c:func:`PyFrame_GetLineNumber` instead.
* ``f_lineno``: use :c:func:`PyFrame_GetLineNumber`
* ``f_locals``: use ``PyObject_GetAttrString((PyObject*)frame, "f_locals")``.
* ``f_locals``: use :c:func:`PyFrame_GetLocals`.
* ``f_stackdepth``: removed.
* ``f_state``: no public API (renamed to ``f_frame.f_state``).
* ``f_trace``: no public API.
@ -983,6 +983,12 @@ Porting to Python 3.11
computed lazily. The :c:func:`PyFrame_GetBack` function must be called
instead.
Debuggers that accessed the ``f_locals`` directly *must* call
`:c:func:`PyFrame_GetLocals` instead. They no longer need to call
`:c:func:`PyFrame_FastToLocalsWithError` or :c:func:`PyFrame_LocalsToFast`,
in fact they should not call those functions. The necessary updating of the
frame is now managed by the virtual machine.
Code defining ``PyFrame_GetCode()`` on Python 3.8 and older::
#if PY_VERSION_HEX < 0x030900B1