intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 197 insertions, 0 deletions

diff --git a/contrib/tools/python3/src/Objects/cellobject.c b/contrib/tools/python3/src/Objects/cellobject.c
new file mode 100644
index 00000000000..86a89f02e60
--- /dev/null
+++ b/contrib/tools/python3/src/Objects/cellobject.c
@@ -0,0 +1,197 @@
+/* Cell object implementation */
+
+#include "Python.h"
+#include "pycore_object.h"
+
+PyObject *
+PyCell_New(PyObject *obj)
+{
+    PyCellObject *op;
+
+    op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
+    if (op == NULL)
+        return NULL;
+    op->ob_ref = obj;
+    Py_XINCREF(obj);
+
+    _PyObject_GC_TRACK(op);
+    return (PyObject *)op;
+}
+
+PyDoc_STRVAR(cell_new_doc,
+"cell([contents])\n"
+"--\n"
+"\n"
+"Create a new cell object.\n"
+"\n"
+"  contents\n"
+"    the contents of the cell. If not specified, the cell will be empty,\n"
+"    and \n further attempts to access its cell_contents attribute will\n"
+"    raise a ValueError.");
+
+
+static PyObject *
+cell_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
+{
+    PyObject *return_value = NULL;
+    PyObject *obj = NULL;
+
+    if (!_PyArg_NoKeywords("cell", kwargs)) {
+        goto exit;
+    }
+    /* min = 0: we allow the cell to be empty */
+    if (!PyArg_UnpackTuple(args, "cell", 0, 1, &obj)) {
+        goto exit;
+    }
+    return_value = PyCell_New(obj);
+
+exit:
+    return return_value;
+}
+
+PyObject *
+PyCell_Get(PyObject *op)
+{
+    if (!PyCell_Check(op)) {
+        PyErr_BadInternalCall();
+        return NULL;
+    }
+    Py_XINCREF(((PyCellObject*)op)->ob_ref);
+    return PyCell_GET(op);
+}
+
+int
+PyCell_Set(PyObject *op, PyObject *obj)
+{
+    PyObject* oldobj;
+    if (!PyCell_Check(op)) {
+        PyErr_BadInternalCall();
+        return -1;
+    }
+    oldobj = PyCell_GET(op);
+    Py_XINCREF(obj);
+    PyCell_SET(op, obj);
+    Py_XDECREF(oldobj);
+    return 0;
+}
+
+static void
+cell_dealloc(PyCellObject *op)
+{
+    _PyObject_GC_UNTRACK(op);
+    Py_XDECREF(op->ob_ref);
+    PyObject_GC_Del(op);
+}
+
+static PyObject *
+cell_richcompare(PyObject *a, PyObject *b, int op)
+{
+    /* neither argument should be NULL, unless something's gone wrong */
+    assert(a != NULL && b != NULL);
+
+    /* both arguments should be instances of PyCellObject */
+    if (!PyCell_Check(a) || !PyCell_Check(b)) {
+        Py_RETURN_NOTIMPLEMENTED;
+    }
+
+    /* compare cells by contents; empty cells come before anything else */
+    a = ((PyCellObject *)a)->ob_ref;
+    b = ((PyCellObject *)b)->ob_ref;
+    if (a != NULL && b != NULL)
+        return PyObject_RichCompare(a, b, op);
+
+    Py_RETURN_RICHCOMPARE(b == NULL, a == NULL, op);
+}
+
+static PyObject *
+cell_repr(PyCellObject *op)
+{
+    if (op->ob_ref == NULL)
+        return PyUnicode_FromFormat("<cell at %p: empty>", op);
+
+    return PyUnicode_FromFormat("<cell at %p: %.80s object at %p>",
+                               op, Py_TYPE(op->ob_ref)->tp_name,
+                               op->ob_ref);
+}
+
+static int
+cell_traverse(PyCellObject *op, visitproc visit, void *arg)
+{
+    Py_VISIT(op->ob_ref);
+    return 0;
+}
+
+static int
+cell_clear(PyCellObject *op)
+{
+    Py_CLEAR(op->ob_ref);
+    return 0;
+}
+
+static PyObject *
+cell_get_contents(PyCellObject *op, void *closure)
+{
+    if (op->ob_ref == NULL)
+    {
+        PyErr_SetString(PyExc_ValueError, "Cell is empty");
+        return NULL;
+    }
+    Py_INCREF(op->ob_ref);
+    return op->ob_ref;
+}
+
+static int
+cell_set_contents(PyCellObject *op, PyObject *obj, void *Py_UNUSED(ignored))
+{
+    Py_XINCREF(obj);
+    Py_XSETREF(op->ob_ref, obj);
+    return 0;
+}
+
+static PyGetSetDef cell_getsetlist[] = {
+    {"cell_contents", (getter)cell_get_contents,
+                      (setter)cell_set_contents, NULL},
+    {NULL} /* sentinel */
+};
+
+PyTypeObject PyCell_Type = {
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    "cell",
+    sizeof(PyCellObject),
+    0,
+    (destructor)cell_dealloc,                   /* tp_dealloc */
+    0,                                          /* tp_vectorcall_offset */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_as_async */
+    (reprfunc)cell_repr,                        /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,    /* tp_flags */
+    cell_new_doc,                               /* tp_doc */
+    (traverseproc)cell_traverse,                /* tp_traverse */
+    (inquiry)cell_clear,                        /* tp_clear */
+    cell_richcompare,                           /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    0,                                          /* tp_members */
+    cell_getsetlist,                            /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    (newfunc)cell_new,                          /* tp_new */
+    0,                                          /* tp_free */
+};