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GC for frame objects.

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Neil Schemenauer 2001-07-12 13:27:11 +00:00
parent b20e9dbf89
commit 19cd292bbc
1 changed files with 101 additions and 12 deletions
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113
Objects/frameobject.c
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@ -70,6 +70,7 @@ frame_dealloc(PyFrameObject *f)
PyObject **p;
Py_TRASHCAN_SAFE_BEGIN(f)
PyObject_GC_Fini(f);
/* Kill all local variables */
slots = f->f_nlocals + f->f_ncells + f->f_nfreevars;
fastlocals = f->f_localsplus;
@ -97,21 +98,102 @@ frame_dealloc(PyFrameObject *f)
Py_TRASHCAN_SAFE_END(f)
}
static int
frame_traverse(PyFrameObject *f, visitproc visit, void *arg)
{
PyObject **fastlocals, **p;
int i, err, slots;
#define VISIT(o) if (o) {if ((err = visit((PyObject *)(o), arg))) return err;}
VISIT(f->f_back);
VISIT(f->f_code);
VISIT(f->f_builtins);
VISIT(f->f_globals);
VISIT(f->f_locals);
VISIT(f->f_trace);
VISIT(f->f_exc_type);
VISIT(f->f_exc_value);
VISIT(f->f_exc_traceback);
/* locals */
slots = f->f_nlocals + f->f_ncells + f->f_nfreevars;
fastlocals = f->f_localsplus;
for (i = slots; --i >= 0; ++fastlocals) {
VISIT(*fastlocals);
}
/* stack */
if (f->f_stacktop != NULL) {
for (p = f->f_valuestack; p < f->f_stacktop; p++)
VISIT(*p);
}
return 0;
}
static void
frame_clear(PyFrameObject *f)
{
PyObject **fastlocals, **p;
int i, slots;
Py_XDECREF(f->f_exc_type);
f->f_exc_type = NULL;
Py_XDECREF(f->f_exc_value);
f->f_exc_value = NULL;
Py_XDECREF(f->f_exc_traceback);
f->f_exc_traceback = NULL;
Py_XDECREF(f->f_trace);
f->f_trace = NULL;
/* locals */
slots = f->f_nlocals + f->f_ncells + f->f_nfreevars;
fastlocals = f->f_localsplus;
for (i = slots; --i >= 0; ++fastlocals) {
if (*fastlocals != NULL) {
Py_XDECREF(*fastlocals);
*fastlocals = NULL;
}
}
/* stack */
if (f->f_stacktop != NULL) {
for (p = f->f_valuestack; p < f->f_stacktop; p++) {
Py_XDECREF(*p);
*p = NULL;
}
}
}
PyTypeObject PyFrame_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"frame",
sizeof(PyFrameObject),
sizeof(PyFrameObject) + PyGC_HEAD_SIZE,
0,
(destructor)frame_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)frame_getattr, /*tp_getattr*/
(setattrfunc)frame_setattr, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
(destructor)frame_dealloc, /* tp_dealloc */
0, /* tp_print */
(getattrfunc)frame_getattr, /* tp_getattr */
(setattrfunc)frame_setattr, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)frame_traverse, /* tp_traverse */
(inquiry)frame_clear, /* tp_clear */
};
PyFrameObject *
@ -155,9 +237,11 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
/* PyObject_New is inlined */
f = (PyFrameObject *)
PyObject_MALLOC(sizeof(PyFrameObject) +
extras*sizeof(PyObject *));
extras*sizeof(PyObject *) +
PyGC_HEAD_SIZE);
if (f == NULL)
return (PyFrameObject *)PyErr_NoMemory();
f = (PyFrameObject *) PyObject_FROM_GC(f);
PyObject_INIT(f, &PyFrame_Type);
f->f_size = extras;
}
@ -165,11 +249,14 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
f = free_list;
free_list = free_list->f_back;
if (f->f_size < extras) {
f = (PyFrameObject *) PyObject_AS_GC(f);
f = (PyFrameObject *)
PyObject_REALLOC(f, sizeof(PyFrameObject) +
extras*sizeof(PyObject *));
extras*sizeof(PyObject *) +
PyGC_HEAD_SIZE);
if (f == NULL)
return (PyFrameObject *)PyErr_NoMemory();
f = (PyFrameObject *) PyObject_FROM_GC(f);
f->f_size = extras;
}
else
@ -230,6 +317,7 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
f->f_valuestack = f->f_localsplus + (f->f_nlocals + ncells + nfrees);
f->f_stacktop = f->f_valuestack;
PyObject_GC_Init(f);
return f;
}
@ -391,6 +479,7 @@ PyFrame_Fini(void)
while (free_list != NULL) {
PyFrameObject *f = free_list;
free_list = free_list->f_back;
f = (PyFrameObject *) PyObject_AS_GC(f);
PyObject_DEL(f);
}
}