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Issue #25557: Refactor _PyDict_LoadGlobal()

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Don't fallback to PyDict_GetItemWithError() if the hash is unknown: compute the
hash instead. Add also comments to explain the optimization a little bit.
This commit is contained in:
Victor Stinner 2015-11-20 09:24:02 +01:00
parent c50ec007ff
commit b4efc963d6
2 changed files with 38 additions and 28 deletions
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11
Python/ceval.c
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@ -2347,26 +2347,33 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
PyObject *name = GETITEM(names, oparg);
PyObject *v;
if (PyDict_CheckExact(f->f_globals)
&& PyDict_CheckExact(f->f_builtins)) {
&& PyDict_CheckExact(f->f_builtins))
{
v = _PyDict_LoadGlobal((PyDictObject *)f->f_globals,
(PyDictObject *)f->f_builtins,
name);
if (v == NULL) {
if (!_PyErr_OCCURRED())
if (!_PyErr_OCCURRED()) {
/* _PyDict_LoadGlobal() returns NULL without raising
* an exception if the key doesn't exist */
format_exc_check_arg(PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
Py_INCREF(v);
}
else {
/* Slow-path if globals or builtins is not a dict */
/* namespace 1: globals */
v = PyObject_GetItem(f->f_globals, name);
if (v == NULL) {
if (!PyErr_ExceptionMatches(PyExc_KeyError))
goto error;
PyErr_Clear();
/* namespace 2: builtins */
v = PyObject_GetItem(f->f_builtins, name);
if (v == NULL) {
if (PyErr_ExceptionMatches(PyExc_KeyError))