cpython/Objects/methodobject.c

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/* Method object implementation */
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#include "Python.h"
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static PyCFunctionObject *free_list = NULL;
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PyObject *
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PyCFunction_New(PyMethodDef *ml, PyObject *self)
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{
PyCFunctionObject *op;
op = free_list;
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if (op != NULL) {
free_list = (PyCFunctionObject *)(op->m_self);
PyObject_INIT(op, &PyCFunction_Type);
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}
else {
op = PyObject_NEW(PyCFunctionObject, &PyCFunction_Type);
if (op == NULL)
return NULL;
}
op->m_ml = ml;
Py_XINCREF(self);
op->m_self = self;
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PyObject_GC_Init(op);
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return (PyObject *)op;
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}
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PyCFunction
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PyCFunction_GetFunction(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
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return NULL;
}
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return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
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}
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PyObject *
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PyCFunction_GetSelf(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
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return NULL;
}
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return ((PyCFunctionObject *)op) -> m_self;
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}
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int
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PyCFunction_GetFlags(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
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return -1;
}
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return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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}
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/* Methods (the standard built-in methods, that is) */
static void
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meth_dealloc(PyCFunctionObject *m)
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{
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PyObject_GC_Fini(m);
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Py_XDECREF(m->m_self);
m->m_self = (PyObject *)free_list;
free_list = m;
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}
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static PyObject *
meth_get__doc__(PyCFunctionObject *m, void *closure)
{
char *doc = m->m_ml->ml_doc;
if (doc != NULL)
return PyString_FromString(doc);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
meth_get__name__(PyCFunctionObject *m, void *closure)
{
return PyString_FromString(m->m_ml->ml_name);
}
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static int
meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
{
if (m->m_self != NULL)
return visit(m->m_self, arg);
else
return 0;
}
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static PyObject *
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meth_get__self__(PyCFunctionObject *m, void *closure)
{
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PyObject *self;
if (PyEval_GetRestricted()) {
PyErr_SetString(PyExc_RuntimeError,
"method.__self__ not accessible in restricted mode");
return NULL;
}
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self = m->m_self;
if (self == NULL)
self = Py_None;
Py_INCREF(self);
return self;
}
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static struct getsetlist meth_getsets [] = {
{"__doc__", (getter)meth_get__doc__, NULL, NULL},
{"__name__", (getter)meth_get__name__, NULL, NULL},
{"__self__", (getter)meth_get__self__, NULL, NULL},
{0}
};
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static PyObject *
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meth_repr(PyCFunctionObject *m)
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{
char buf[200];
if (m->m_self == NULL)
sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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else
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sprintf(buf,
"<built-in method %.80s of %.80s object at %p>",
m->m_ml->ml_name, m->m_self->ob_type->tp_name,
m->m_self);
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return PyString_FromString(buf);
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}
static int
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meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
{
if (a->m_self != b->m_self)
return (a->m_self < b->m_self) ? -1 : 1;
if (a->m_ml->ml_meth == b->m_ml->ml_meth)
return 0;
if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
return -1;
else
return 1;
}
static long
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meth_hash(PyCFunctionObject *a)
{
long x,y;
if (a->m_self == NULL)
x = 0;
else {
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x = PyObject_Hash(a->m_self);
if (x == -1)
return -1;
}
y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
if (y == -1)
return -1;
x ^= y;
if (x == -1)
x = -2;
return x;
}
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static PyObject *
meth_call(PyObject *func, PyObject *arg, PyObject *kw)
{
PyCFunctionObject* f = (PyCFunctionObject*)func;
PyCFunction meth = PyCFunction_GET_FUNCTION(func);
PyObject *self = PyCFunction_GET_SELF(func);
int flags = PyCFunction_GET_FLAGS(func);
if (flags & METH_KEYWORDS) {
return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
}
if (kw != NULL && PyDict_Size(kw) != 0) {
PyErr_Format(PyExc_TypeError,
"%.200s() takes no keyword arguments",
f->m_ml->ml_name);
return NULL;
}
if (flags & METH_VARARGS) {
return (*meth)(self, arg);
}
if (!(flags & METH_VARARGS)) {
/* the really old style */
int size = PyTuple_GET_SIZE(arg);
if (size == 1)
arg = PyTuple_GET_ITEM(arg, 0);
else if (size == 0)
arg = NULL;
return (*meth)(self, arg);
}
/* should never get here ??? */
PyErr_BadInternalCall();
return NULL;
}
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PyTypeObject PyCFunction_Type = {
PyObject_HEAD_INIT(&PyType_Type)
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0,
"builtin_function_or_method",
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sizeof(PyCFunctionObject) + PyGC_HEAD_SIZE,
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0,
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(destructor)meth_dealloc, /* tp_dealloc */
0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
(cmpfunc)meth_compare, /* tp_compare */
(reprfunc)meth_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)meth_hash, /* tp_hash */
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meth_call, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)meth_traverse, /* tp_traverse */
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0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
meth_getsets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
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};
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/* List all methods in a chain -- helper for findmethodinchain */
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static PyObject *
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listmethodchain(PyMethodChain *chain)
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{
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PyMethodChain *c;
PyMethodDef *ml;
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int i, n;
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PyObject *v;
n = 0;
for (c = chain; c != NULL; c = c->link) {
for (ml = c->methods; ml->ml_name != NULL; ml++)
n++;
}
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v = PyList_New(n);
if (v == NULL)
return NULL;
i = 0;
for (c = chain; c != NULL; c = c->link) {
for (ml = c->methods; ml->ml_name != NULL; ml++) {
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PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
i++;
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}
}
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if (PyErr_Occurred()) {
Py_DECREF(v);
return NULL;
}
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PyList_Sort(v);
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return v;
}
/* Find a method in a method chain */
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PyObject *
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Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, char *name)
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{
if (name[0] == '_' && name[1] == '_') {
if (strcmp(name, "__methods__") == 0)
return listmethodchain(chain);
if (strcmp(name, "__doc__") == 0) {
char *doc = self->ob_type->tp_doc;
if (doc != NULL)
return PyString_FromString(doc);
}
}
while (chain != NULL) {
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PyMethodDef *ml = chain->methods;
for (; ml->ml_name != NULL; ml++) {
if (name[0] == ml->ml_name[0] &&
strcmp(name+1, ml->ml_name+1) == 0)
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return PyCFunction_New(ml, self);
}
chain = chain->link;
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}
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PyErr_SetString(PyExc_AttributeError, name);
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return NULL;
}
/* Find a method in a single method list */
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PyObject *
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Py_FindMethod(PyMethodDef *methods, PyObject *self, char *name)
{
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PyMethodChain chain;
chain.methods = methods;
chain.link = NULL;
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return Py_FindMethodInChain(&chain, self, name);
}
/* Clear out the free list */
void
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PyCFunction_Fini(void)
{
while (free_list) {
PyCFunctionObject *v = free_list;
free_list = (PyCFunctionObject *)(v->m_self);
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v = (PyCFunctionObject *) PyObject_AS_GC(v);
PyObject_DEL(v);
}
}