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Refactor the logic for setting f_builtins. 

For the case where the current globals match the previous frame's
globals, eliminates three tests in two if statements.  For the case
where we just get __builtins__ from a module, eliminate a couple of
tests.
This commit is contained in:
Jeremy Hylton 2003-02-05 22:39:29 +00:00
parent 64edd6ac1d
commit bd5cbf866f
1 changed files with 31 additions and 24 deletions
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55
Objects/frameobject.c
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@ -554,16 +554,34 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
extras = code->co_stacksize + code->co_nlocals + ncells + nfrees;
if (back == NULL || back->f_globals != globals) {
builtins = PyDict_GetItem(globals, builtin_object);
if (builtins != NULL && PyModule_Check(builtins))
builtins = PyModule_GetDict(builtins);
if (builtins) {
if (PyModule_Check(builtins)) {
builtins = PyModule_GetDict(builtins);
assert(!builtins || PyDict_Check(builtins));
}
else if (!PyDict_Check(builtins))
builtins = NULL;
}
if (builtins == NULL) {
/* No builtins! Make up a minimal one
Give them 'None', at least. */
builtins = PyDict_New();
if (builtins == NULL ||
PyDict_SetItemString(
builtins, "None", Py_None) < 0)
return NULL;
}
else
Py_INCREF(builtins);
}
else {
/* If we share the globals, we share the builtins.
Save a lookup and a call. */
builtins = back->f_builtins;
assert(builtins != NULL && PyDict_Check(builtins));
Py_INCREF(builtins);
}
if (builtins != NULL && !PyDict_Check(builtins))
builtins = NULL;
if (free_list == NULL) {
f = PyObject_GC_NewVar(PyFrameObject, &PyFrame_Type, extras);
if (f == NULL)
@ -581,17 +599,6 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
}
_Py_NewReference((PyObject *)f);
}
if (builtins == NULL) {
/* No builtins! Make up a minimal one. */
builtins = PyDict_New();
if (builtins == NULL || /* Give them 'None', at least. */
PyDict_SetItemString(builtins, "None", Py_None) < 0) {
Py_DECREF(f);
return NULL;
}
}
else
Py_INCREF(builtins);
f->f_builtins = builtins;
Py_XINCREF(back);
f->f_back = back;
@ -599,15 +606,15 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
f->f_code = code;
Py_INCREF(globals);
f->f_globals = globals;
if (code->co_flags & CO_NEWLOCALS) {
if (code->co_flags & CO_OPTIMIZED)
locals = NULL; /* Let fast_2_locals handle it */
else {
locals = PyDict_New();
if (locals == NULL) {
Py_DECREF(f);
return NULL;
}
/* Most functions have CO_NEWLOCALS and CO_OPTIMIZED set. */
if ((code->co_flags & (CO_NEWLOCALS | CO_OPTIMIZED)) ==
(CO_NEWLOCALS | CO_OPTIMIZED))
locals = NULL; /* PyFrame_Fast2Locals() will set. */
else if (code->co_flags & CO_NEWLOCALS) {
locals = PyDict_New();
if (locals == NULL) {
Py_DECREF(f);
return NULL;
}
}
else {