mirror of
https://github.com/python/cpython.git
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319 lines
6.9 KiB
C
319 lines
6.9 KiB
C
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/* Method object implementation */
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#include "Python.h"
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#include "structmember.h"
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/* Free list for method objects to safe malloc/free overhead
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* The m_self element is used to chain the objects.
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*/
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static PyCFunctionObject *free_list = NULL;
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static int numfree = 0;
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#ifndef PyCFunction_MAXFREELIST
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#define PyCFunction_MAXFREELIST 256
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#endif
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PyObject *
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PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
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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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numfree--;
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}
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else {
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op = PyObject_GC_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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Py_XINCREF(module);
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op->m_module = module;
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_PyObject_GC_TRACK(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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Py_ssize_t size;
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switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
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case METH_VARARGS:
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if (kw == NULL || PyDict_Size(kw) == 0)
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return (*meth)(self, arg);
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break;
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case METH_VARARGS | METH_KEYWORDS:
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return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
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case METH_NOARGS:
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if (kw == NULL || PyDict_Size(kw) == 0) {
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size = PyTuple_GET_SIZE(arg);
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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 (%zd given)",
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f->m_ml->ml_name, size);
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return NULL;
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}
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break;
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case METH_O:
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if (kw == NULL || PyDict_Size(kw) == 0) {
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size = PyTuple_GET_SIZE(arg);
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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 (%zd given)",
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f->m_ml->ml_name, size);
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return NULL;
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}
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break;
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default:
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PyErr_SetString(PyExc_SystemError, "Bad call flags in "
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"PyCFunction_Call. METH_OLDARGS is no "
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"longer supported!");
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return NULL;
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}
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PyErr_Format(PyExc_TypeError, "%.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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/* 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_UNTRACK(m);
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Py_XDECREF(m->m_self);
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Py_XDECREF(m->m_module);
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if (numfree < PyCFunction_MAXFREELIST) {
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m->m_self = (PyObject *)free_list;
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free_list = m;
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numfree++;
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}
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else {
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PyObject_GC_Del(m);
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}
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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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const char *doc = m->m_ml->ml_doc;
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if (doc != NULL)
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return PyUnicode_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 PyUnicode_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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Py_VISIT(m->m_self);
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Py_VISIT(m->m_module);
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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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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 PyGetSetDef 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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#define OFF(x) offsetof(PyCFunctionObject, x)
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static PyMemberDef meth_members[] = {
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{"__module__", T_OBJECT, OFF(m_module), PY_WRITE_RESTRICTED},
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{NULL}
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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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if (m->m_self == NULL || PyModule_Check(m->m_self))
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return PyUnicode_FromFormat("<built-in function %s>",
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m->m_ml->ml_name);
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return PyUnicode_FromFormat("<built-in method %s of %s object at %p>",
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m->m_ml->ml_name,
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m->m_self->ob_type->tp_name,
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m->m_self);
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}
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static PyObject *
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meth_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyCFunctionObject *a, *b;
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PyObject *res;
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int eq;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyCFunction_Check(self) ||
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!PyCFunction_Check(other))
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{
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Py_INCREF(Py_NotImplemented);
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return Py_NotImplemented;
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}
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a = (PyCFunctionObject *)self;
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b = (PyCFunctionObject *)other;
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eq = a->m_self == b->m_self;
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if (eq)
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eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
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if (op == Py_EQ)
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res = eq ? Py_True : Py_False;
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else
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res = eq ? Py_False : Py_True;
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Py_INCREF(res);
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return res;
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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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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"builtin_function_or_method",
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sizeof(PyCFunctionObject),
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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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0, /* tp_reserved */
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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_HAVE_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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meth_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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meth_members, /* 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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/* Clear out the free list */
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int
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PyCFunction_ClearFreeList(void)
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{
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int freelist_size = numfree;
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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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PyObject_GC_Del(v);
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numfree--;
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}
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assert(numfree == 0);
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return freelist_size;
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}
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void
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PyCFunction_Fini(void)
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{
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(void)PyCFunction_ClearFreeList();
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}
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/* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
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but it's part of the API so we need to keep a function around that
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existing C extensions can call.
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*/
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#undef PyCFunction_New
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PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
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PyObject *
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PyCFunction_New(PyMethodDef *ml, PyObject *self)
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{
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return PyCFunction_NewEx(ml, self, NULL);
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}
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