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bpo-42085: Introduce dedicated entry in PyAsyncMethods for sending values (#22780)

This commit is contained in:
Vladimir Matveev 2020-11-10 12:09:55 -08:00 committed by GitHub
parent e59b2deffd
commit 1e996c3a3b
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 146 additions and 49 deletions
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16
Doc/c-api/typeobj.rst
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@ -199,6 +199,8 @@ sub-slots
+---------------------------------------------------------+-----------------------------------+--------------+
| :c:member:`~PyAsyncMethods.am_anext` | :c:type:`unaryfunc` | __anext__ |
+---------------------------------------------------------+-----------------------------------+--------------+
| :c:member:`~PyAsyncMethods.am_send` | :c:type:`sendfunc` | |
+---------------------------------------------------------+-----------------------------------+--------------+
| |
+---------------------------------------------------------+-----------------------------------+--------------+
| :c:member:`~PyNumberMethods.nb_add` | :c:type:`binaryfunc` | __add__ |
@ -2304,6 +2306,7 @@ Async Object Structures
unaryfunc am_await;
unaryfunc am_aiter;
unaryfunc am_anext;
sendfunc am_send;
} PyAsyncMethods;
.. c:member:: unaryfunc PyAsyncMethods.am_await
@ -2337,6 +2340,15 @@ Async Object Structures
Must return an :term:`awaitable` object. See :meth:`__anext__` for details.
This slot may be set to ``NULL``.
.. c:member:: sendfunc PyAsyncMethods.am_send
The signature of this function is::
PySendResult am_send(PyObject *self, PyObject *arg, PyObject **result);
See :c:func:`PyIter_Send` for details.
This slot may be set to ``NULL``.
.. _slot-typedefs:
@ -2432,6 +2444,10 @@ Slot Type typedefs
.. c:type:: PyObject *(*binaryfunc)(PyObject *, PyObject *)
.. c:type:: PySendResult (*sendfunc)(PyObject *, PyObject *, PyObject **)
See :c:member:`~PyAsyncMethods.am_send`.
.. c:type:: PyObject *(*ternaryfunc)(PyObject *, PyObject *, PyObject *)
.. c:type:: PyObject *(*ssizeargfunc)(PyObject *, Py_ssize_t)

5
Include/abstract.h
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@ -339,11 +339,6 @@ PyAPI_FUNC(int) PyIter_Check(PyObject *);
PyAPI_FUNC(PyObject *) PyIter_Next(PyObject *);
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000
typedef enum {
PYGEN_RETURN = 0,
PYGEN_ERROR = -1,
PYGEN_NEXT = 1,
} PySendResult;
/* Takes generator, coroutine or iterator object and sends the value into it.
Returns:

3
Include/cpython/object.h
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@ -167,10 +167,13 @@ typedef struct {
objobjargproc mp_ass_subscript;
} PyMappingMethods;
typedef PySendResult (*sendfunc)(PyObject *iter, PyObject *value, PyObject **result);
typedef struct {
unaryfunc am_await;
unaryfunc am_aiter;
unaryfunc am_anext;
sendfunc am_send;
} PyAsyncMethods;
typedef struct {

14
Include/object.h
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@ -356,6 +356,11 @@ given type object has a specified feature.
/* Type is abstract and cannot be instantiated */
#define Py_TPFLAGS_IS_ABSTRACT (1UL << 20)
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000
/* Type has am_send entry in tp_as_async slot */
#define Py_TPFLAGS_HAVE_AM_SEND (1UL << 21)
#endif
/* These flags are used to determine if a type is a subclass. */
#define Py_TPFLAGS_LONG_SUBCLASS (1UL << 24)
#define Py_TPFLAGS_LIST_SUBCLASS (1UL << 25)
@ -582,6 +587,15 @@ PyAPI_DATA(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */
#define Py_GT 4
#define Py_GE 5
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000
/* Result of calling PyIter_Send */
typedef enum {
PYGEN_RETURN = 0,
PYGEN_ERROR = -1,
PYGEN_NEXT = 1,
} PySendResult;
#endif
/*
* Macro for implementing rich comparisons
*

4
Include/typeslots.h
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@ -88,3 +88,7 @@
/* New in 3.5 */
#define Py_tp_finalize 80
#endif
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000
/* New in 3.10 */
#define Py_am_send 81
#endif

2
Lib/test/test_sys.py
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@ -1407,7 +1407,7 @@ class SizeofTest(unittest.TestCase):
check(int, s)
# class
s = vsize(fmt + # PyTypeObject
'3P' # PyAsyncMethods
'4P' # PyAsyncMethods
'36P' # PyNumberMethods
'3P' # PyMappingMethods
'10P' # PySequenceMethods

1
Misc/NEWS.d/next/C API/2020-10-19-15-58-16.bpo-42085.NhEf3W.rst Normal file
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@ -0,0 +1 @@
Add dedicated entry to PyAsyncMethods for sending values

56
Modules/_asynciomodule.c
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@ -1479,7 +1479,8 @@ future_cls_getitem(PyObject *cls, PyObject *type)
static PyAsyncMethods FutureType_as_async = {
(unaryfunc)future_new_iter, /* am_await */
0, /* am_aiter */
0 /* am_anext */
0, /* am_anext */
0, /* am_send */
};
static PyMethodDef FutureType_methods[] = {
@ -1597,37 +1598,60 @@ FutureIter_dealloc(futureiterobject *it)
}
}
static PyObject *
FutureIter_iternext(futureiterobject *it)
static PySendResult
FutureIter_am_send(futureiterobject *it,
PyObject *Py_UNUSED(arg),
PyObject **result)
{
/* arg is unused, see the comment on FutureIter_send for clarification */
PyObject *res;
FutureObj *fut = it->future;
*result = NULL;
if (fut == NULL) {
return NULL;
return PYGEN_ERROR;
}
if (fut->fut_state == STATE_PENDING) {
if (!fut->fut_blocking) {
fut->fut_blocking = 1;
Py_INCREF(fut);
return (PyObject *)fut;
*result = (PyObject *)fut;
return PYGEN_NEXT;
}
PyErr_SetString(PyExc_RuntimeError,
"await wasn't used with future");
return NULL;
return PYGEN_ERROR;
}
it->future = NULL;
res = _asyncio_Future_result_impl(fut);
if (res != NULL) {
/* The result of the Future is not an exception. */
(void)_PyGen_SetStopIterationValue(res);
Py_DECREF(res);
*result = res;
return PYGEN_RETURN;
}
Py_DECREF(fut);
return NULL;
return PYGEN_ERROR;
}
static PyObject *
FutureIter_iternext(futureiterobject *it)
{
PyObject *result;
switch (FutureIter_am_send(it, Py_None, &result)) {
case PYGEN_RETURN:
(void)_PyGen_SetStopIterationValue(result);
Py_DECREF(result);
return NULL;
case PYGEN_NEXT:
return result;
case PYGEN_ERROR:
return NULL;
default:
Py_UNREACHABLE();
}
}
static PyObject *
@ -1716,14 +1740,24 @@ static PyMethodDef FutureIter_methods[] = {
{NULL, NULL} /* Sentinel */
};
static PyAsyncMethods FutureIterType_as_async = {
0, /* am_await */
0, /* am_aiter */
0, /* am_anext */
(sendfunc)FutureIter_am_send, /* am_send */
};
static PyTypeObject FutureIterType = {
PyVarObject_HEAD_INIT(NULL, 0)
"_asyncio.FutureIter",
.tp_basicsize = sizeof(futureiterobject),
.tp_itemsize = 0,
.tp_dealloc = (destructor)FutureIter_dealloc,
.tp_as_async = &FutureIterType_as_async,
.tp_getattro = PyObject_GenericGetAttr,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_AM_SEND,
.tp_traverse = (traverseproc)FutureIter_traverse,
.tp_iter = PyObject_SelfIter,
.tp_iternext = (iternextfunc)FutureIter_iternext,

3
Modules/_testcapimodule.c
View File

@ -6142,7 +6142,8 @@ awaitObject_await(awaitObject *ao)
static PyAsyncMethods awaitType_as_async = {
(unaryfunc)awaitObject_await, /* am_await */
0, /* am_aiter */
0 /* am_anext */
0, /* am_anext */
0, /* am_send */
};

26
Objects/abstract.c
View File

@ -2669,6 +2669,32 @@ PyIter_Next(PyObject *iter)
return result;
}
PySendResult
PyIter_Send(PyObject *iter, PyObject *arg, PyObject **result)
{
_Py_IDENTIFIER(send);
assert(arg != NULL);
assert(result != NULL);
if (PyType_HasFeature(Py_TYPE(iter), Py_TPFLAGS_HAVE_AM_SEND)) {
assert (Py_TYPE(iter)->tp_as_async != NULL);
assert (Py_TYPE(iter)->tp_as_async->am_send != NULL);
return Py_TYPE(iter)->tp_as_async->am_send(iter, arg, result);
}
if (arg == Py_None && PyIter_Check(iter)) {
*result = Py_TYPE(iter)->tp_iternext(iter);
}
else {
*result = _PyObject_CallMethodIdOneArg(iter, &PyId_send, arg);
}
if (*result != NULL) {
return PYGEN_NEXT;
}
if (_PyGen_FetchStopIterationValue(result) == 0) {
return PYGEN_RETURN;
}
return PYGEN_ERROR;
}
/*
* Flatten a sequence of bytes() objects into a C array of
* NULL terminated string pointers with a NULL char* terminating the array.

57
Objects/genobject.c
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@ -268,30 +268,10 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
return result ? PYGEN_RETURN : PYGEN_ERROR;
}
PySendResult
PyIter_Send(PyObject *iter, PyObject *arg, PyObject **result)
static PySendResult
PyGen_am_send(PyGenObject *gen, PyObject *arg, PyObject **result)
{
_Py_IDENTIFIER(send);
assert(arg != NULL);
assert(result != NULL);
if (PyGen_CheckExact(iter) || PyCoro_CheckExact(iter)) {
return gen_send_ex2((PyGenObject *)iter, arg, result, 0, 0);
}
if (arg == Py_None && PyIter_Check(iter)) {
*result = Py_TYPE(iter)->tp_iternext(iter);
}
else {
*result = _PyObject_CallMethodIdOneArg(iter, &PyId_send, arg);
}
if (*result != NULL) {
return PYGEN_NEXT;
}
if (_PyGen_FetchStopIterationValue(result) == 0) {
return PYGEN_RETURN;
}
return PYGEN_ERROR;
return gen_send_ex2(gen, arg, result, 0, 0);
}
static PyObject *
@ -788,6 +768,14 @@ static PyMethodDef gen_methods[] = {
{NULL, NULL} /* Sentinel */
};
static PyAsyncMethods gen_as_async = {
0, /* am_await */
0, /* am_aiter */
0, /* am_anext */
(sendfunc)PyGen_am_send, /* am_send */
};
PyTypeObject PyGen_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"generator", /* tp_name */
@ -798,7 +786,7 @@ PyTypeObject PyGen_Type = {
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
&gen_as_async, /* tp_as_async */
(reprfunc)gen_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
@ -809,7 +797,8 @@ PyTypeObject PyGen_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_AM_SEND, /* tp_flags */
0, /* tp_doc */
(traverseproc)gen_traverse, /* tp_traverse */
0, /* tp_clear */
@ -1031,7 +1020,8 @@ static PyMethodDef coro_methods[] = {
static PyAsyncMethods coro_as_async = {
(unaryfunc)coro_await, /* am_await */
0, /* am_aiter */
0 /* am_anext */
0, /* am_anext */
(sendfunc)PyGen_am_send, /* am_send */
};
PyTypeObject PyCoro_Type = {
@ -1055,7 +1045,8 @@ PyTypeObject PyCoro_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_AM_SEND, /* tp_flags */
0, /* tp_doc */
(traverseproc)gen_traverse, /* tp_traverse */
0, /* tp_clear */
@ -1413,7 +1404,8 @@ static PyMethodDef async_gen_methods[] = {
static PyAsyncMethods async_gen_as_async = {
0, /* am_await */
PyObject_SelfIter, /* am_aiter */
(unaryfunc)async_gen_anext /* am_anext */
(unaryfunc)async_gen_anext, /* am_anext */
(sendfunc)PyGen_am_send, /* am_send */
};
@ -1438,7 +1430,8 @@ PyTypeObject PyAsyncGen_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_AM_SEND, /* tp_flags */
0, /* tp_doc */
(traverseproc)async_gen_traverse, /* tp_traverse */
0, /* tp_clear */
@ -1676,7 +1669,8 @@ static PyMethodDef async_gen_asend_methods[] = {
static PyAsyncMethods async_gen_asend_as_async = {
PyObject_SelfIter, /* am_await */
0, /* am_aiter */
0 /* am_anext */
0, /* am_anext */
0, /* am_send */
};
@ -2084,7 +2078,8 @@ static PyMethodDef async_gen_athrow_methods[] = {
static PyAsyncMethods async_gen_athrow_as_async = {
PyObject_SelfIter, /* am_await */
0, /* am_aiter */
0 /* am_anext */
0, /* am_anext */
0, /* am_send */
};

7
Objects/typeobject.c
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@ -5427,6 +5427,13 @@ PyType_Ready(PyTypeObject *type)
_PyObject_ASSERT((PyObject *)type, type->tp_vectorcall_offset > 0);
_PyObject_ASSERT((PyObject *)type, type->tp_call != NULL);
}
/* Consistency check for Py_TPFLAGS_HAVE_AM_SEND - flag requires
* type->tp_as_async->am_send to be present.
*/
if (type->tp_flags & Py_TPFLAGS_HAVE_AM_SEND) {
_PyObject_ASSERT((PyObject *)type, type->tp_as_async != NULL);
_PyObject_ASSERT((PyObject *)type, type->tp_as_async->am_send != NULL);
}
type->tp_flags |= Py_TPFLAGS_READYING;

1
Objects/typeslots.inc generated
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@ -79,3 +79,4 @@ offsetof(PyHeapTypeObject, as_async.am_await),
offsetof(PyHeapTypeObject, as_async.am_aiter),
offsetof(PyHeapTypeObject, as_async.am_anext),
offsetof(PyHeapTypeObject, ht_type.tp_finalize),
offsetof(PyHeapTypeObject, as_async.am_send),