mirror of https://github.com/python/cpython
160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
/* Cell object implementation */
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#include "Python.h"
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#include "pycore_object.h"
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#include "pycore_pymem.h"
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#include "pycore_pystate.h"
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PyObject *
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PyCell_New(PyObject *obj)
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{
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PyCellObject *op;
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op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
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if (op == NULL)
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return NULL;
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op->ob_ref = obj;
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Py_XINCREF(obj);
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_PyObject_GC_TRACK(op);
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return (PyObject *)op;
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}
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PyObject *
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PyCell_Get(PyObject *op)
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{
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if (!PyCell_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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Py_XINCREF(((PyCellObject*)op)->ob_ref);
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return PyCell_GET(op);
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}
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int
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PyCell_Set(PyObject *op, PyObject *obj)
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{
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PyObject* oldobj;
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if (!PyCell_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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oldobj = PyCell_GET(op);
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Py_XINCREF(obj);
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PyCell_SET(op, obj);
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Py_XDECREF(oldobj);
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return 0;
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}
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static void
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cell_dealloc(PyCellObject *op)
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{
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_PyObject_GC_UNTRACK(op);
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Py_XDECREF(op->ob_ref);
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PyObject_GC_Del(op);
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}
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static PyObject *
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cell_richcompare(PyObject *a, PyObject *b, int op)
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{
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/* neither argument should be NULL, unless something's gone wrong */
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assert(a != NULL && b != NULL);
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/* both arguments should be instances of PyCellObject */
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if (!PyCell_Check(a) || !PyCell_Check(b)) {
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Py_RETURN_NOTIMPLEMENTED;
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}
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/* compare cells by contents; empty cells come before anything else */
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a = ((PyCellObject *)a)->ob_ref;
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b = ((PyCellObject *)b)->ob_ref;
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if (a != NULL && b != NULL)
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return PyObject_RichCompare(a, b, op);
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Py_RETURN_RICHCOMPARE(b == NULL, a == NULL, op);
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}
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static PyObject *
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cell_repr(PyCellObject *op)
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{
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if (op->ob_ref == NULL)
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return PyUnicode_FromFormat("<cell at %p: empty>", op);
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return PyUnicode_FromFormat("<cell at %p: %.80s object at %p>",
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op, op->ob_ref->ob_type->tp_name,
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op->ob_ref);
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}
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static int
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cell_traverse(PyCellObject *op, visitproc visit, void *arg)
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{
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Py_VISIT(op->ob_ref);
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return 0;
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}
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static int
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cell_clear(PyCellObject *op)
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{
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Py_CLEAR(op->ob_ref);
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return 0;
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}
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static PyObject *
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cell_get_contents(PyCellObject *op, void *closure)
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{
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if (op->ob_ref == NULL)
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{
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PyErr_SetString(PyExc_ValueError, "Cell is empty");
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return NULL;
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}
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Py_INCREF(op->ob_ref);
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return op->ob_ref;
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}
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static int
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cell_set_contents(PyCellObject *op, PyObject *obj)
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{
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Py_XINCREF(obj);
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Py_XSETREF(op->ob_ref, obj);
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return 0;
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}
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static PyGetSetDef cell_getsetlist[] = {
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{"cell_contents", (getter)cell_get_contents,
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(setter)cell_set_contents, NULL},
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{NULL} /* sentinel */
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};
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PyTypeObject PyCell_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"cell",
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sizeof(PyCellObject),
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0,
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(destructor)cell_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)cell_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
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0, /* tp_doc */
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(traverseproc)cell_traverse, /* tp_traverse */
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(inquiry)cell_clear, /* tp_clear */
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cell_richcompare, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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cell_getsetlist, /* tp_getset */
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};
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