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Add METH_FASTCALL calling convention

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Issue #27810: Add a new calling convention for C functions:

    PyObject* func(PyObject *self, PyObject **args,
                   Py_ssize_t nargs, PyObject *kwnames);

Where args is a C array of positional arguments followed by values of keyword
arguments. nargs is the number of positional arguments, kwnames are keys of
keyword arguments. kwnames can be NULL.
This commit is contained in:
Victor Stinner 2016-09-09 17:40:22 -07:00
parent 78601a38c2
commit a9efb2f56e
5 changed files with 102 additions and 1 deletions
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24
Objects/methodobject.c
View file

@ -97,6 +97,11 @@ PyCFunction_Call(PyObject *func, PyObject *args, PyObject *kwds)
if (flags == (METH_VARARGS | METH_KEYWORDS)) {
res = (*(PyCFunctionWithKeywords)meth)(self, args, kwds);
}
else if (flags == METH_FASTCALL) {
PyObject **stack = &PyTuple_GET_ITEM(args, 0);
Py_ssize_t nargs = PyTuple_GET_SIZE(args);
res = _PyCFunction_FastCallDict(func, stack, nargs, kwds);
}
else {
if (kwds != NULL && PyDict_Size(kwds) != 0) {
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
@ -232,6 +237,25 @@ _PyCFunction_FastCallDict(PyObject *func_obj, PyObject **args, Py_ssize_t nargs,
break;
}
case METH_FASTCALL:
{
PyObject **stack;
PyObject *kwnames;
_PyCFunctionFast fastmeth = (_PyCFunctionFast)meth;
stack = _PyStack_UnpackDict(args, nargs, kwargs, &kwnames, func_obj);
if (stack == NULL) {
return NULL;
}
result = (*fastmeth) (self, stack, nargs, kwnames);
if (stack != args) {
PyMem_Free(stack);
}
Py_XDECREF(kwnames);
break;
}
default:
PyErr_SetString(PyExc_SystemError,
"Bad call flags in PyCFunction_Call. "