bpo-36974: document PEP 590 (GH-13450)
This commit is contained in:
Jeroen Demeyer
Petr Viktorin
parent
82eac26a73
commit
9e3e06e582
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@ -335,6 +335,83 @@ Object Protocol
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*NULL* on failure.
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.. c:function:: PyObject* _PyObject_Vectorcall(PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwnames)
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Call a callable Python object *callable*, using
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:c:data:`vectorcall <PyTypeObject.tp_vectorcall_offset>` if possible.
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*args* is a C array with the positional arguments.
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*nargsf* is the number of positional arguments plus optionally the flag
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:const:`PY_VECTORCALL_ARGUMENTS_OFFSET` (see below).
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To get actual number of arguments, use
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:c:func:`PyVectorcall_NARGS(nargsf) <PyVectorcall_NARGS>`.
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*kwnames* can be either NULL (no keyword arguments) or a tuple of keyword
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names. In the latter case, the values of the keyword arguments are stored
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in *args* after the positional arguments.
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The number of keyword arguments does not influence *nargsf*.
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*kwnames* must contain only objects of type ``str`` (not a subclass),
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and all keys must be unique.
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Return the result of the call on success, or *NULL* on failure.
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This uses the vectorcall protocol if the callable supports it;
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otherwise, the arguments are converted to use
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:c:member:`~PyTypeObject.tp_call`.
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.. note::
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This function is provisional and expected to become public in Python 3.9,
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with a different name and, possibly, changed semantics.
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If you use the function, plan for updating your code for Python 3.9.
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.. versionadded:: 3.8
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.. c:var:: PY_VECTORCALL_ARGUMENTS_OFFSET
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If set in a vectorcall *nargsf* argument, the callee is allowed to
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temporarily change ``args[-1]``. In other words, *args* points to
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argument 1 (not 0) in the allocated vector.
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The callee must restore the value of ``args[-1]`` before returning.
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Whenever they can do so cheaply (without additional allocation), callers
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are encouraged to use :const:`PY_VECTORCALL_ARGUMENTS_OFFSET`.
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Doing so will allow callables such as bound methods to make their onward
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calls (which include a prepended *self* argument) cheaply.
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.. versionadded:: 3.8
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.. c:function:: Py_ssize_t PyVectorcall_NARGS(size_t nargsf)
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Given a vectorcall *nargsf* argument, return the actual number of
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arguments.
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Currently equivalent to ``nargsf & ~PY_VECTORCALL_ARGUMENTS_OFFSET``.
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.. versionadded:: 3.8
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.. c:function:: PyObject* _PyObject_FastCallDict(PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwdict)
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Same as :c:func:`_PyObject_Vectorcall` except that the keyword arguments
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are passed as a dictionary in *kwdict*. This may be *NULL* if there
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are no keyword arguments.
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For callables supporting :c:data:`vectorcall <PyTypeObject.tp_vectorcall_offset>`,
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the arguments are internally converted to the vectorcall convention.
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Therefore, this function adds some overhead compared to
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:c:func:`_PyObject_Vectorcall`.
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It should only be used if the caller already has a dictionary ready to use.
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.. note::
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This function is provisional and expected to become public in Python 3.9,
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with a different name and, possibly, changed semantics.
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If you use the function, plan for updating your code for Python 3.9.
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.. versionadded:: 3.8
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.. c:function:: Py_hash_t PyObject_Hash(PyObject *o)
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.. index:: builtin: hash
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@ -36,115 +36,115 @@ Quick Reference
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.. table::
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:widths: 18,18,18,1,1,1,1
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+---------------------------------------------+-----------------------------------+-------------------+---------------+
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| PyTypeObject Slot [#slots]_ | :ref:`Type <slot-typedefs-table>` | special | Info [#cols]_ |
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| | | methods/attrs +---+---+---+---+
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| | | | O | T | D | I |
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+=============================================+===================================+===================+===+===+===+===+
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| <R> :c:member:`~PyTypeObject.tp_name` | const char * | __name__ | X | X | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_basicsize` | Py_ssize_t | | X | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_itemsize` | Py_ssize_t | | | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dealloc` | :c:type:`destructor` | | X | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_print`) | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_getattr`) | :c:type:`getattrfunc` | __getattribute__, | | | | G |
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| | | __getattr__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_setattr`) | :c:type:`setattrfunc` | __setattr__, | | | | G |
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| | | __delattr__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_async` | :c:type:`PyAsyncMethods` * | :ref:`sub-slots` | | | | % |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_repr` | :c:type:`reprfunc` | __repr__ | X | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_number` | :c:type:`PyNumberMethods` * | :ref:`sub-slots` | | | | % |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_sequence` | :c:type:`PySequenceMethods` * | :ref:`sub-slots` | | | | % |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_mapping` | :c:type:`PyMappingMethods` * | :ref:`sub-slots` | | | | % |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_hash` | :c:type:`hashfunc` | __hash__ | X | | | G |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_call` | :c:type:`ternaryfunc` | __call__ | | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_str` | :c:type:`reprfunc` | __str__ | X | | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_getattro` | :c:type:`getattrofunc` | __getattribute__, | X | X | | G |
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| | | __getattr__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_setattro` | :c:type:`setattrofunc` | __setattr__, | X | X | | G |
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| | | __delattr__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_buffer` | :c:type:`PyBufferProcs` * | | | | | % |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_flags` | unsigned long | | X | X | | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_doc` | const char * | __doc__ | X | X | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_traverse` | :c:type:`traverseproc` | | | X | | G |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_clear` | :c:type:`inquiry` | | | X | | G |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_richcompare` | :c:type:`richcmpfunc` | __lt__, | X | | | G |
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| | | __le__, | | | | |
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| | | __eq__, | | | | |
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| | | __ne__, | | | | |
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| | | __gt__, | | | | |
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| | | __ge__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_weaklistoffset` | Py_ssize_t | | | X | | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_iter` | :c:type:`getiterfunc` | __iter__ | | | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_iternext` | :c:type:`iternextfunc` | __next__ | | | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_methods` | :c:type:`PyMethodDef` [] | | X | X | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_members` | :c:type:`PyMemberDef` [] | | | X | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_getset` | :c:type:`PyGetSetDef` [] | | X | X | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_base` | :c:type:`PyTypeObject` * | __base__ | | | X | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dict` | :c:type:`PyObject` * | __dict__ | | | ? | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_descr_get` | :c:type:`descrgetfunc` | __get__ | | | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_descr_set` | :c:type:`descrsetfunc` | __set__, | | | | X |
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| | | __delete__ | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dictoffset` | Py_ssize_t | | | X | | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_init` | :c:type:`initproc` | __init__ | X | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_alloc` | :c:type:`allocfunc` | | X | | ? | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_new` | :c:type:`newfunc` | __new__ | X | X | ? | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_free` | :c:type:`freefunc` | | X | X | ? | ? |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_is_gc` | :c:type:`inquiry` | | | X | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| <:c:member:`~PyTypeObject.tp_bases`> | :c:type:`PyObject` * | __bases__ | | | ~ | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| <:c:member:`~PyTypeObject.tp_mro`> | :c:type:`PyObject` * | __mro__ | | | ~ | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| [:c:member:`~PyTypeObject.tp_cache`] | :c:type:`PyObject` * | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| [:c:member:`~PyTypeObject.tp_subclasses`] | :c:type:`PyObject` * | __subclasses__ | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| [:c:member:`~PyTypeObject.tp_weaklist`] | :c:type:`PyObject` * | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_del`) | :c:type:`destructor` | | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| [:c:member:`~PyTypeObject.tp_version_tag`] | unsigned int | | | | |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_finalize` | :c:type:`destructor` | __del__ | | | | X |
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+---------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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+------------------------------------------------+-----------------------------------+-------------------+---------------+
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| PyTypeObject Slot [#slots]_ | :ref:`Type <slot-typedefs-table>` | special | Info [#cols]_ |
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| | | methods/attrs +---+---+---+---+
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| | | | O | T | D | I |
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+================================================+===================================+===================+===+===+===+===+
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| <R> :c:member:`~PyTypeObject.tp_name` | const char * | __name__ | X | X | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_basicsize` | Py_ssize_t | | X | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_itemsize` | Py_ssize_t | | | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dealloc` | :c:type:`destructor` | | X | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_vectorcall_offset` | Py_ssize_t | | | | | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_getattr`) | :c:type:`getattrfunc` | __getattribute__, | | | | G |
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| | | __getattr__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| (:c:member:`~PyTypeObject.tp_setattr`) | :c:type:`setattrfunc` | __setattr__, | | | | G |
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| | | __delattr__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_async` | :c:type:`PyAsyncMethods` * | :ref:`sub-slots` | | | | % |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_repr` | :c:type:`reprfunc` | __repr__ | X | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_number` | :c:type:`PyNumberMethods` * | :ref:`sub-slots` | | | | % |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_sequence` | :c:type:`PySequenceMethods` * | :ref:`sub-slots` | | | | % |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_mapping` | :c:type:`PyMappingMethods` * | :ref:`sub-slots` | | | | % |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_hash` | :c:type:`hashfunc` | __hash__ | X | | | G |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_call` | :c:type:`ternaryfunc` | __call__ | | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_str` | :c:type:`reprfunc` | __str__ | X | | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_getattro` | :c:type:`getattrofunc` | __getattribute__, | X | X | | G |
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| | | __getattr__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_setattro` | :c:type:`setattrofunc` | __setattr__, | X | X | | G |
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| | | __delattr__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_as_buffer` | :c:type:`PyBufferProcs` * | | | | | % |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_flags` | unsigned long | | X | X | | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_doc` | const char * | __doc__ | X | X | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_traverse` | :c:type:`traverseproc` | | | X | | G |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_clear` | :c:type:`inquiry` | | | X | | G |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_richcompare` | :c:type:`richcmpfunc` | __lt__, | X | | | G |
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| | | __le__, | | | | |
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| | | __eq__, | | | | |
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| | | __ne__, | | | | |
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| | | __gt__, | | | | |
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| | | __ge__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_weaklistoffset` | Py_ssize_t | | | X | | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_iter` | :c:type:`getiterfunc` | __iter__ | | | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_iternext` | :c:type:`iternextfunc` | __next__ | | | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_methods` | :c:type:`PyMethodDef` [] | | X | X | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_members` | :c:type:`PyMemberDef` [] | | | X | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_getset` | :c:type:`PyGetSetDef` [] | | X | X | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_base` | :c:type:`PyTypeObject` * | __base__ | | | X | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dict` | :c:type:`PyObject` * | __dict__ | | | ? | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_descr_get` | :c:type:`descrgetfunc` | __get__ | | | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_descr_set` | :c:type:`descrsetfunc` | __set__, | | | | X |
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| | | __delete__ | | | | |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_dictoffset` | Py_ssize_t | | | X | | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_init` | :c:type:`initproc` | __init__ | X | X | | X |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_alloc` | :c:type:`allocfunc` | | X | | ? | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_new` | :c:type:`newfunc` | __new__ | X | X | ? | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
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| :c:member:`~PyTypeObject.tp_free` | :c:type:`freefunc` | | X | X | ? | ? |
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+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| :c:member:`~PyTypeObject.tp_is_gc` | :c:type:`inquiry` | | | X | | X |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| <:c:member:`~PyTypeObject.tp_bases`> | :c:type:`PyObject` * | __bases__ | | | ~ | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| <:c:member:`~PyTypeObject.tp_mro`> | :c:type:`PyObject` * | __mro__ | | | ~ | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| [:c:member:`~PyTypeObject.tp_cache`] | :c:type:`PyObject` * | | | | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| [:c:member:`~PyTypeObject.tp_subclasses`] | :c:type:`PyObject` * | __subclasses__ | | | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| [:c:member:`~PyTypeObject.tp_weaklist`] | :c:type:`PyObject` * | | | | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| (:c:member:`~PyTypeObject.tp_del`) | :c:type:`destructor` | | | | | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| [:c:member:`~PyTypeObject.tp_version_tag`] | unsigned int | | | | |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
| :c:member:`~PyTypeObject.tp_finalize` | :c:type:`destructor` | __del__ | | | | X |
|
||||
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
|
||||
|
||||
If :const:`COUNT_ALLOCS` is defined then the following (internal-only)
|
||||
fields exist as well:
|
||||
|
|
@ -364,12 +364,6 @@ slot typedefs
|
|||
+-----------------------------+-----------------------------+----------------------+
|
||||
| :c:type:`reprfunc` | :c:type:`PyObject` * | :c:type:`PyObject` * |
|
||||
+-----------------------------+-----------------------------+----------------------+
|
||||
| :c:type:`printfunc` | .. line-block:: | int |
|
||||
| | | |
|
||||
| | :c:type:`PyObject` * | |
|
||||
| | FILE * | |
|
||||
| | int | |
|
||||
+-----------------------------+-----------------------------+----------------------+
|
||||
| :c:type:`getattrfunc` | .. line-block:: | :c:type:`PyObject` * |
|
||||
| | | |
|
||||
| | :c:type:`PyObject` * | |
|
||||
|
|
@ -675,9 +669,66 @@ and :c:type:`PyType_Type` effectively act as defaults.)
|
|||
This field is inherited by subtypes.
|
||||
|
||||
|
||||
.. c:member:: printfunc PyTypeObject.tp_print
|
||||
.. c:member:: Py_ssize_t PyTypeObject.tp_vectorcall_offset
|
||||
|
||||
Reserved slot, formerly used for print formatting in Python 2.x.
|
||||
An optional offset to a per-instance function that implements calling
|
||||
the object using the *vectorcall* protocol, a more efficient alternative
|
||||
of the simpler :c:member:`~PyTypeObject.tp_call`.
|
||||
|
||||
This field is only used if the flag :const:`_Py_TPFLAGS_HAVE_VECTORCALL`
|
||||
is set. If so, this must be a positive integer containing the offset in the
|
||||
instance of a :c:type:`vectorcallfunc` pointer.
|
||||
The signature is the same as for :c:func:`_PyObject_Vectorcall`::
|
||||
|
||||
PyObject *vectorcallfunc(PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwnames)
|
||||
|
||||
The *vectorcallfunc* pointer may be zero, in which case the instance behaves
|
||||
as if :const:`_Py_TPFLAGS_HAVE_VECTORCALL` was not set: calling the instance
|
||||
falls back to :c:member:`~PyTypeObject.tp_call`.
|
||||
|
||||
Any class that sets ``_Py_TPFLAGS_HAVE_VECTORCALL`` must also set
|
||||
:c:member:`~PyTypeObject.tp_call` and make sure its behaviour is consistent
|
||||
with the *vectorcallfunc* function.
|
||||
This can be done by setting *tp_call* to ``PyVectorcall_Call``:
|
||||
|
||||
.. c:function:: PyObject *PyVectorcall_Call(PyObject *callable, PyObject *tuple, PyObject *dict)
|
||||
|
||||
Call *callable*'s *vectorcallfunc* with positional and keyword
|
||||
arguments given in a tuple and dict, respectively.
|
||||
|
||||
This function is intended to be used in the ``tp_call`` slot.
|
||||
It does not fall back to ``tp_call`` and it currently does not check the
|
||||
``_Py_TPFLAGS_HAVE_VECTORCALL`` flag.
|
||||
To call an object, use one of the :c:func:`PyObject_Call <PyObject_Call>`
|
||||
functions instead.
|
||||
|
||||
.. note::
|
||||
|
||||
It is not recommended for :ref:`heap types <heap-types>` to implement
|
||||
the vectorcall protocol.
|
||||
When a user sets ``__call__`` in Python code, only ``tp_call`` is updated,
|
||||
possibly making it inconsistent with the vectorcall function.
|
||||
|
||||
.. note::
|
||||
|
||||
The semantics of the ``tp_vectorcall_offset`` slot are provisional and
|
||||
expected to be finalized in Python 3.9.
|
||||
If you use vectorcall, plan for updating your code for Python 3.9.
|
||||
|
||||
.. versionchanged:: 3.8
|
||||
|
||||
This slot was used for print formatting in Python 2.x.
|
||||
In Python 3.0 to 3.7, it was reserved and named ``tp_print``.
|
||||
|
||||
**Inheritance:**
|
||||
|
||||
This field is inherited by subtypes together with
|
||||
:c:member:`~PyTypeObject.tp_call`: a subtype inherits
|
||||
:c:member:`~PyTypeObject.tp_vectorcall_offset` from its base type when
|
||||
the subtype’s :c:member:`~PyTypeObject.tp_call` is NULL.
|
||||
|
||||
Note that `heap types`_ (including subclasses defined in Python) do not
|
||||
inherit the :const:`_Py_TPFLAGS_HAVE_VECTORCALL` flag.
|
||||
|
||||
|
||||
.. c:member:: getattrfunc PyTypeObject.tp_getattr
|
||||
|
|
@ -1104,6 +1155,28 @@ and :c:type:`PyType_Type` effectively act as defaults.)
|
|||
:c:member:`~PyTypeObject.tp_finalize` slot is always present in the
|
||||
type structure.
|
||||
|
||||
.. data:: _Py_TPFLAGS_HAVE_VECTORCALL
|
||||
|
||||
This bit is set when the class implements the vectorcall protocol.
|
||||
See :c:member:`~PyTypeObject.tp_vectorcall_offset` for details.
|
||||
|
||||
**Inheritance:**
|
||||
|
||||
This bit is set on *static* subtypes if ``tp_flags`` is not overridden:
|
||||
a subtype inherits ``_Py_TPFLAGS_HAVE_VECTORCALL`` from its base type
|
||||
when the subtype’s :c:member:`~PyTypeObject.tp_call` is NULL
|
||||
and the subtype's ``Py_TPFLAGS_HEAPTYPE`` is not set.
|
||||
|
||||
`Heap types`_ do not inherit ``_Py_TPFLAGS_HAVE_VECTORCALL``.
|
||||
|
||||
.. note::
|
||||
|
||||
This flag is provisional and expected to become public in Python 3.9,
|
||||
with a different name and, possibly, changed semantics.
|
||||
If you use vectorcall, plan for updating your code for Python 3.9.
|
||||
|
||||
.. versionadded:: 3.8
|
||||
|
||||
|
||||
.. c:member:: const char* PyTypeObject.tp_doc
|
||||
|
||||
|
|
@ -2286,6 +2359,14 @@ Slot Type typedefs
|
|||
|
||||
.. c:type:: void (*destructor)(PyObject *)
|
||||
|
||||
.. c:type:: PyObject *(*vectorcallfunc)(PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwnames)
|
||||
|
||||
See :c:member:`~PyTypeObject.tp_vectorcall_offset`.
|
||||
|
||||
Arguments to ``vectorcallfunc`` are the same as for :c:func:`_PyObject_Vectorcall`.
|
||||
|
||||
.. versionadded:: 3.8
|
||||
|
||||
.. c:type:: void (*freefunc)(void *)
|
||||
|
||||
See :c:member:`~PyTypeObject.tp_free`.
|
||||
|
|
@ -2302,10 +2383,6 @@ Slot Type typedefs
|
|||
|
||||
See :c:member:`~PyTypeObject.tp_repr`.
|
||||
|
||||
.. c:type:: int (*printfunc)(PyObject *, FILE *, int)
|
||||
|
||||
This is hidden if :const:`PY_LIMITED_API` is set.
|
||||
|
||||
.. c:type:: PyObject *(*getattrfunc)(PyObject *self, char *attr)
|
||||
|
||||
Return the value of the named attribute for the object.
|
||||
|
|
@ -2409,7 +2486,7 @@ with a more verbose initializer::
|
|||
sizeof(MyObject), /* tp_basicsize */
|
||||
0, /* tp_itemsize */
|
||||
(destructor)myobj_dealloc, /* tp_dealloc */
|
||||
0, /* tp_print */
|
||||
0, /* tp_vectorcall_offset */
|
||||
0, /* tp_getattr */
|
||||
0, /* tp_setattr */
|
||||
0, /* tp_as_async */
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ typedef struct _typeobject {
|
|||
/* Methods to implement standard operations */
|
||||
|
||||
destructor tp_dealloc;
|
||||
printfunc tp_print;
|
||||
Py_ssize_t tp_vectorcall_offset;
|
||||
getattrfunc tp_getattr;
|
||||
setattrfunc tp_setattr;
|
||||
PyAsyncMethods *tp_as_async; /* formerly known as tp_compare (Python 2)
|
||||
|
|
|
|||
|
|
@ -238,6 +238,22 @@ See :pep:`587` for a full description.
|
|||
(Contributed by Victor Stinner in :issue:`36763`.)
|
||||
|
||||
|
||||
Vectorcall: a fast calling protocol for CPython
|
||||
-----------------------------------------------
|
||||
|
||||
The "vectorcall" protocol is added to the Python/C API.
|
||||
It is meant to formalize existing optimizations which were already done
|
||||
for various classes.
|
||||
Any extension type implementing a callable can use this protocol.
|
||||
|
||||
This is currently provisional,
|
||||
the aim is to make it fully public in Python 3.9.
|
||||
|
||||
See :pep:`590` for a full description.
|
||||
|
||||
(Contributed by Jeroen Demeyer and Mark Shannon in :issue:`36974`.)
|
||||
|
||||
|
||||
Other Language Changes
|
||||
======================
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue