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Optimize call to Python function without argument 

Issue #27128. When a Python function is called with no arguments, but all
parameters have a default value: use default values as arguments for the fast
path.
This commit is contained in:
Victor Stinner 2016-08-22 12:29:42 +02:00
parent 0add84b9b8
commit 2eedc119c2
1 changed files with 31 additions and 11 deletions
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42
Python/ceval.c
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@ -4801,8 +4801,8 @@ call_function(PyObject ***pp_stack, int oparg
*/
static PyObject*
_PyFunction_FastCallNoKw(PyObject **args, Py_ssize_t na,
PyCodeObject *co, PyObject *globals)
_PyFunction_FastCallNoKw(PyCodeObject *co, PyObject **args, Py_ssize_t na,
PyObject *globals)
{
PyFrameObject *f;
PyThreadState *tstate = PyThreadState_GET();
@ -4837,8 +4837,10 @@ _PyFunction_FastCallNoKw(PyObject **args, Py_ssize_t na,
return result;
}
/* Similar to _PyFunction_FastCall() but keywords are passed a (key, value)
pairs in stack */
static PyObject *
fast_function(PyObject *func, PyObject **stack, int n, int na, int nk)
fast_function(PyObject *func, PyObject **stack, int n, int nargs, int nk)
{
PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);
PyObject *globals = PyFunction_GET_GLOBALS(func);
@ -4850,11 +4852,20 @@ fast_function(PyObject *func, PyObject **stack, int n, int na, int nk)
PCALL(PCALL_FUNCTION);
PCALL(PCALL_FAST_FUNCTION);
if (argdefs == NULL && co->co_argcount == na &&
co->co_kwonlyargcount == 0 && nk == 0 &&
if (co->co_kwonlyargcount == 0 && nk == 0 &&
co->co_flags == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE))
{
return _PyFunction_FastCallNoKw(stack, na, co, globals);
if (argdefs == NULL && co->co_argcount == nargs) {
return _PyFunction_FastCallNoKw(co, stack, nargs, globals);
}
else if (nargs == 0 && argdefs != NULL
&& co->co_argcount == Py_SIZE(argdefs)) {
/* function called with no arguments, but all parameters have
a default value: use default values as arguments .*/
stack = &PyTuple_GET_ITEM(argdefs, 0);
return _PyFunction_FastCallNoKw(co, stack, Py_SIZE(argdefs),
globals);
}
}
kwdefs = PyFunction_GET_KW_DEFAULTS(func);
@ -4871,8 +4882,8 @@ fast_function(PyObject *func, PyObject **stack, int n, int na, int nk)
nd = 0;
}
return _PyEval_EvalCodeWithName((PyObject*)co, globals, (PyObject *)NULL,
stack, na,
stack + na, nk,
stack, nargs,
stack + nargs, nk,
d, nd, kwdefs,
closure, name, qualname);
}
@ -4893,11 +4904,20 @@ _PyFunction_FastCall(PyObject *func, PyObject **args, int nargs, PyObject *kwarg
/* issue #27128: support for keywords will come later */
assert(kwargs == NULL);
if (argdefs == NULL && co->co_argcount == nargs &&
co->co_kwonlyargcount == 0 &&
if (co->co_kwonlyargcount == 0 && kwargs == NULL &&
co->co_flags == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE))
{
return _PyFunction_FastCallNoKw(args, nargs, co, globals);
if (argdefs == NULL && co->co_argcount == nargs) {
return _PyFunction_FastCallNoKw(co, args, nargs, globals);
}
else if (nargs == 0 && argdefs != NULL
&& co->co_argcount == Py_SIZE(argdefs)) {
/* function called with no arguments, but all parameters have
a default value: use default values as arguments .*/
args = &PyTuple_GET_ITEM(argdefs, 0);
return _PyFunction_FastCallNoKw(co, args, Py_SIZE(argdefs),
globals);
}
}
kwdefs = PyFunction_GET_KW_DEFAULTS(func);