mirror of https://github.com/python/cpython
339 lines
7.1 KiB
C
339 lines
7.1 KiB
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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{
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PyCFunctionObject *op;
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op = free_list;
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if (op != NULL) {
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free_list = (PyCFunctionObject *)(op->m_self);
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PyObject_INIT(op, &PyCFunction_Type);
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}
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else {
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op = PyObject_NEW(PyCFunctionObject, &PyCFunction_Type);
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if (op == NULL)
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return NULL;
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}
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op->m_ml = ml;
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Py_XINCREF(self);
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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)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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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)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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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)) {
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PyErr_BadInternalCall();
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return -1;
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}
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return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
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}
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PyObject *
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PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
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{
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PyCFunctionObject* f = (PyCFunctionObject*)func;
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PyCFunction meth = PyCFunction_GET_FUNCTION(func);
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PyObject *self = PyCFunction_GET_SELF(func);
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int flags = PyCFunction_GET_FLAGS(func);
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int size = PyTuple_GET_SIZE(arg);
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if (flags & METH_KEYWORDS) {
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return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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}
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if (kw != NULL && PyDict_Size(kw) != 0) {
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PyErr_Format(PyExc_TypeError,
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"%.200s() takes no keyword arguments",
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f->m_ml->ml_name);
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return NULL;
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}
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switch (flags) {
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case METH_VARARGS:
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return (*meth)(self, arg);
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break;
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case METH_NOARGS:
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if (size == 0)
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return (*meth)(self, NULL);
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PyErr_Format(PyExc_TypeError,
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"%.200s() takes no arguments (%d given)",
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f->m_ml->ml_name, size);
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return NULL;
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break;
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case METH_O:
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if (size == 1)
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return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
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PyErr_Format(PyExc_TypeError,
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"%.200s() takes exactly one argument (%d given)",
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f->m_ml->ml_name, size);
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return NULL;
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break;
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case METH_OLDARGS:
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/* the really old style */
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if (size == 1)
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arg = PyTuple_GET_ITEM(arg, 0);
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else if (size == 0)
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arg = NULL;
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return (*meth)(self, arg);
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default:
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/* should never get here ??? */
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PyErr_BadInternalCall();
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return NULL;
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}
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}
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/* Methods (the standard built-in methods, that is) */
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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);
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m->m_self = (PyObject *)free_list;
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free_list = m;
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}
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static PyObject *
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meth_get__doc__(PyCFunctionObject *m, void *closure)
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{
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char *doc = m->m_ml->ml_doc;
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if (doc != NULL)
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return PyString_FromString(doc);
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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meth_get__name__(PyCFunctionObject *m, void *closure)
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{
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return PyString_FromString(m->m_ml->ml_name);
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}
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static int
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meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
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{
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if (m->m_self != NULL)
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return visit(m->m_self, arg);
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else
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return 0;
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}
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static PyObject *
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meth_get__self__(PyCFunctionObject *m, void *closure)
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{
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PyObject *self;
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if (PyEval_GetRestricted()) {
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PyErr_SetString(PyExc_RuntimeError,
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"method.__self__ not accessible in restricted mode");
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return NULL;
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}
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self = m->m_self;
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if (self == NULL)
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self = Py_None;
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Py_INCREF(self);
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return self;
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}
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static struct getsetlist meth_getsets [] = {
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{"__doc__", (getter)meth_get__doc__, NULL, NULL},
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{"__name__", (getter)meth_get__name__, NULL, NULL},
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{"__self__", (getter)meth_get__self__, NULL, NULL},
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{0}
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};
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static PyObject *
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meth_repr(PyCFunctionObject *m)
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{
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char buf[200];
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if (m->m_self == NULL)
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sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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else
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sprintf(buf,
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"<built-in method %.80s of %.80s object at %p>",
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m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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m->m_self);
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return PyString_FromString(buf);
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}
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static int
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meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
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{
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if (a->m_self != b->m_self)
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return (a->m_self < b->m_self) ? -1 : 1;
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if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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return 0;
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if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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return -1;
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else
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return 1;
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}
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static long
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meth_hash(PyCFunctionObject *a)
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{
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long x,y;
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if (a->m_self == NULL)
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x = 0;
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else {
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x = PyObject_Hash(a->m_self);
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if (x == -1)
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return -1;
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}
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y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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if (y == -1)
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return -1;
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x ^= y;
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if (x == -1)
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x = -2;
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return x;
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}
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PyTypeObject PyCFunction_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"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 */
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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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(cmpfunc)meth_compare, /* tp_compare */
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(reprfunc)meth_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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(hashfunc)meth_hash, /* tp_hash */
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PyCFunction_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 */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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0, /* tp_doc */
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(traverseproc)meth_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* 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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meth_getsets, /* tp_getset */
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0, /* tp_base */
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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;
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PyMethodDef *ml;
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int i, n;
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PyObject *v;
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n = 0;
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for (c = chain; c != NULL; c = c->link) {
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for (ml = c->methods; ml->ml_name != NULL; ml++)
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n++;
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}
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v = PyList_New(n);
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if (v == NULL)
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return NULL;
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i = 0;
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for (c = chain; c != NULL; c = c->link) {
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for (ml = c->methods; ml->ml_name != NULL; ml++) {
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PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
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i++;
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}
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}
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if (PyErr_Occurred()) {
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Py_DECREF(v);
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return NULL;
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}
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PyList_Sort(v);
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return v;
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}
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/* 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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{
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if (name[0] == '_' && name[1] == '_') {
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if (strcmp(name, "__methods__") == 0)
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return listmethodchain(chain);
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if (strcmp(name, "__doc__") == 0) {
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char *doc = self->ob_type->tp_doc;
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if (doc != NULL)
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return PyString_FromString(doc);
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}
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}
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while (chain != NULL) {
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PyMethodDef *ml = chain->methods;
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for (; ml->ml_name != NULL; ml++) {
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if (name[0] == ml->ml_name[0] &&
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strcmp(name+1, ml->ml_name+1) == 0)
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return PyCFunction_New(ml, self);
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}
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chain = chain->link;
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}
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PyErr_SetString(PyExc_AttributeError, name);
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return NULL;
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}
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/* 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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{
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PyMethodChain chain;
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chain.methods = methods;
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chain.link = NULL;
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return Py_FindMethodInChain(&chain, self, name);
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}
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/* Clear out the free list */
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void
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PyCFunction_Fini(void)
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{
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while (free_list) {
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PyCFunctionObject *v = free_list;
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free_list = (PyCFunctionObject *)(v->m_self);
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v = (PyCFunctionObject *) PyObject_AS_GC(v);
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PyObject_DEL(v);
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}
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}
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