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bpo-40584: Update PyType_FromModuleAndSpec to process tp_vectorcall_offset #20026

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Merged
merged 2 commits into from
May 11, 2020
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bpo-40584: Update PyType_FromModuleAndSpec to process tp_vectorcall_offset #20026

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b6c98c5
Update PyType_FromModuleAndSpec to process tp_vectorcall_offset
shihai1991 May 10, 2020
7798062
update docs of tp_vectorcall_offset of PyTypeObject
shihai1991 May 11, 2020
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8 changes: 5 additions & 3 deletions Doc/c-api/structures.rst
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Expand Up @@ -424,9 +424,11 @@ Accessing attributes of extension types

Heap allocated types (created using :c:func:`PyType_FromSpec` or similar),
``PyMemberDef`` may contain definitions for the special members
``__dictoffset__`` and ``__weaklistoffset__``, corresponding to
:c:member:`~PyTypeObject.tp_dictoffset` and
:c:member:`~PyTypeObject.tp_weaklistoffset` in type objects.
``__dictoffset__``, ``__weaklistoffset__`` and ``__vectorcalloffset__``,
corresponding to
:c:member:`~PyTypeObject.tp_dictoffset`,
:c:member:`~PyTypeObject.tp_weaklistoffset` and
:c:member:`~PyTypeObject.tp_vectorcall_offset` in type objects.
These must be defined with ``T_PYSSIZET`` and ``READONLY``, for example::

static PyMemberDef spam_type_members[] = {
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1 change: 1 addition & 0 deletions Doc/c-api/type.rst
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Expand Up @@ -228,6 +228,7 @@ The following functions and structs are used to create
* :c:member:`~PyTypeObject.tp_dictoffset`
(see :ref:`PyMemberDef <pymemberdef-offsets>`)
* :c:member:`~PyTypeObject.tp_vectorcall_offset`
(see :ref:`PyMemberDef <pymemberdef-offsets>`)
* :c:member:`~PyBufferProcs.bf_getbuffer`
* :c:member:`~PyBufferProcs.bf_releasebuffer`

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14 changes: 12 additions & 2 deletions Objects/typeobject.c
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Expand Up @@ -2954,10 +2954,10 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
PyTypeObject *type, *base;

const PyType_Slot *slot;
Py_ssize_t nmembers, weaklistoffset, dictoffset;
Py_ssize_t nmembers, weaklistoffset, dictoffset, vectorcalloffset;
char *res_start;

nmembers = weaklistoffset = dictoffset = 0;
nmembers = weaklistoffset = dictoffset = vectorcalloffset = 0;
for (slot = spec->slots; slot->slot; slot++) {
if (slot->slot == Py_tp_members) {
nmembers = 0;
Expand All @@ -2975,6 +2975,12 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
assert(memb->flags == READONLY);
dictoffset = memb->offset;
}
if (strcmp(memb->name, "__vectorcalloffset__") == 0) {
// The PyMemberDef must be a Py_ssize_t and readonly
assert(memb->type == T_PYSSIZET);
assert(memb->flags == READONLY);
vectorcalloffset = memb->offset;
}
}
}
}
Expand Down Expand Up @@ -3123,6 +3129,10 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
type->tp_dealloc = subtype_dealloc;
}

if (vectorcalloffset) {
type->tp_vectorcall_offset = vectorcalloffset;
}

if (PyType_Ready(type) < 0)
goto fail;

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