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bpo-37233: optimize method_vectorcall in case of totalargs == 0 (GH-14550)

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(cherry picked from commit 53c2143440)

Co-authored-by: Jeroen Demeyer <J.Demeyer@UGent.be>
This commit is contained in:
Miss Islington (bot) 2019-07-03 06:06:38 -07:00 • committed by GitHub
parent c7570d402e
commit 1099e343e8
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 6 deletions
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16
Objects/classobject.c
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@ -62,9 +62,13 @@ method_vectorcall(PyObject *method, PyObject *const *args,
}
else {
Py_ssize_t nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);
PyObject **newargs;
Py_ssize_t totalargs = nargs + nkwargs;
if (totalargs == 0) {
return _PyObject_Vectorcall(func, &self, 1, NULL);
}
PyObject *newargs_stack[_PY_FASTCALL_SMALL_STACK];
PyObject **newargs;
if (totalargs <= (Py_ssize_t)Py_ARRAY_LENGTH(newargs_stack) - 1) {
newargs = newargs_stack;
}
@ -77,11 +81,11 @@ method_vectorcall(PyObject *method, PyObject *const *args,
}
/* use borrowed references */
newargs[0] = self;
if (totalargs) { /* bpo-37138: if totalargs == 0, then args may be
* NULL and calling memcpy() with a NULL pointer
* is undefined behaviour. */
memcpy(newargs + 1, args, totalargs * sizeof(PyObject *));
}
/* bpo-37138: since totalargs > 0, it's impossible that args is NULL.
* We need this, since calling memcpy() with a NULL pointer is
* undefined behaviour. */
assert(args != NULL);
memcpy(newargs + 1, args, totalargs * sizeof(PyObject *));
result = _PyObject_Vectorcall(func, newargs, nargs+1, kwnames);
if (newargs != newargs_stack) {
PyMem_Free(newargs);