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bpo-38644: Add Py_EnterRecursiveCall() to the limited API (GH-17046)

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Provide Py_EnterRecursiveCall() and Py_LeaveRecursiveCall() as
regular functions for the limited API. Previously, there were defined
as macros, but these macros didn't work with the limited API which
cannot access PyThreadState.recursion_depth field.

Remove _Py_CheckRecursionLimit from the stable ABI.

Add Include/cpython/ceval.h header file.
This commit is contained in:
Victor Stinner 2019-11-04 19:48:34 +01:00 • committed by GitHub
parent 6552563b3d
commit f4b1e3d7c6
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9 changed files with 101 additions and 38 deletions
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12
Doc/c-api/exceptions.rst
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@ -715,15 +715,21 @@ recursion depth automatically).
case, a :exc:`RecursionError` is set and a nonzero value is returned.
Otherwise, zero is returned.
*where* should be a string such as ``" in instance check"`` to be
concatenated to the :exc:`RecursionError` message caused by the recursion
*where* should be a UTF-8 encoded string such as ``" in instance check"`` to
be concatenated to the :exc:`RecursionError` message caused by the recursion
depth limit.
.. c:function:: void Py_LeaveRecursiveCall()
.. versionchanged:: 3.9
This function is now also available in the limited API.
.. c:function:: void Py_LeaveRecursiveCall(void)
Ends a :c:func:`Py_EnterRecursiveCall`. Must be called once for each
*successful* invocation of :c:func:`Py_EnterRecursiveCall`.
.. versionchanged:: 3.9
This function is now also available in the limited API.
Properly implementing :c:member:`~PyTypeObject.tp_repr` for container types requires
special recursion handling. In addition to protecting the stack,
:c:member:`~PyTypeObject.tp_repr` also needs to track objects to prevent cycles. The

6
Doc/whatsnew/3.9.rst
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@ -197,6 +197,12 @@ Optimizations
Build and C API Changes
=======================
* Provide :c:func:`Py_EnterRecursiveCall` and :c:func:`Py_LeaveRecursiveCall`
as regular functions for the limited API. Previously, there were defined as
macros, but these macros didn't work with the limited API which cannot access
``PyThreadState.recursion_depth`` field. Remove ``_Py_CheckRecursionLimit``
from the stable ABI.
(Contributed by Victor Stinner in :issue:`38644`.)
* Add a new public :c:func:`PyObject_CallNoArgs` function to the C API, which
calls a callable Python object without any arguments. It is the most efficient
way to call a callable Python object without any argument.