ref: 8417787f994891759273865919b34b5a2e6e8735
dir: /sys/src/cmd/python/Objects/methodobject.c/
/* Method object implementation */ #include "Python.h" #include "structmember.h" static PyCFunctionObject *free_list = NULL; PyObject * PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module) { PyCFunctionObject *op; op = free_list; if (op != NULL) { free_list = (PyCFunctionObject *)(op->m_self); PyObject_INIT(op, &PyCFunction_Type); } else { op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type); if (op == NULL) return NULL; } op->m_ml = ml; Py_XINCREF(self); op->m_self = self; Py_XINCREF(module); op->m_module = module; _PyObject_GC_TRACK(op); return (PyObject *)op; } PyCFunction PyCFunction_GetFunction(PyObject *op) { if (!PyCFunction_Check(op)) { PyErr_BadInternalCall(); return NULL; } return ((PyCFunctionObject *)op) -> m_ml -> ml_meth; } PyObject * PyCFunction_GetSelf(PyObject *op) { if (!PyCFunction_Check(op)) { PyErr_BadInternalCall(); return NULL; } return ((PyCFunctionObject *)op) -> m_self; } int PyCFunction_GetFlags(PyObject *op) { if (!PyCFunction_Check(op)) { PyErr_BadInternalCall(); return -1; } return ((PyCFunctionObject *)op) -> m_ml -> ml_flags; } PyObject * PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw) { PyCFunctionObject* f = (PyCFunctionObject*)func; PyCFunction meth = PyCFunction_GET_FUNCTION(func); PyObject *self = PyCFunction_GET_SELF(func); Py_ssize_t size; switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) { case METH_VARARGS: if (kw == NULL || PyDict_Size(kw) == 0) return (*meth)(self, arg); break; case METH_VARARGS | METH_KEYWORDS: case METH_OLDARGS | METH_KEYWORDS: return (*(PyCFunctionWithKeywords)meth)(self, arg, kw); case METH_NOARGS: if (kw == NULL || PyDict_Size(kw) == 0) { size = PyTuple_GET_SIZE(arg); if (size == 0) return (*meth)(self, NULL); PyErr_Format(PyExc_TypeError, "%.200s() takes no arguments (%zd given)", f->m_ml->ml_name, size); return NULL; } break; case METH_O: if (kw == NULL || PyDict_Size(kw) == 0) { size = PyTuple_GET_SIZE(arg); if (size == 1) return (*meth)(self, PyTuple_GET_ITEM(arg, 0)); PyErr_Format(PyExc_TypeError, "%.200s() takes exactly one argument (%zd given)", f->m_ml->ml_name, size); return NULL; } break; case METH_OLDARGS: /* the really old style */ if (kw == NULL || PyDict_Size(kw) == 0) { size = PyTuple_GET_SIZE(arg); if (size == 1) arg = PyTuple_GET_ITEM(arg, 0); else if (size == 0) arg = NULL; return (*meth)(self, arg); } break; default: PyErr_BadInternalCall(); return NULL; } PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments", f->m_ml->ml_name); return NULL; } /* Methods (the standard built-in methods, that is) */ static void meth_dealloc(PyCFunctionObject *m) { _PyObject_GC_UNTRACK(m); Py_XDECREF(m->m_self); Py_XDECREF(m->m_module); m->m_self = (PyObject *)free_list; free_list = m; } static PyObject * meth_get__doc__(PyCFunctionObject *m, void *closure) { const 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); } static int meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg) { Py_VISIT(m->m_self); Py_VISIT(m->m_module); return 0; } static PyObject * meth_get__self__(PyCFunctionObject *m, void *closure) { PyObject *self; if (PyEval_GetRestricted()) { PyErr_SetString(PyExc_RuntimeError, "method.__self__ not accessible in restricted mode"); return NULL; } self = m->m_self; if (self == NULL) self = Py_None; Py_INCREF(self); return self; } static PyGetSetDef meth_getsets [] = { {"__doc__", (getter)meth_get__doc__, NULL, NULL}, {"__name__", (getter)meth_get__name__, NULL, NULL}, {"__self__", (getter)meth_get__self__, NULL, NULL}, {0} }; #define OFF(x) offsetof(PyCFunctionObject, x) static PyMemberDef meth_members[] = { {"__module__", T_OBJECT, OFF(m_module), WRITE_RESTRICTED}, {NULL} }; static PyObject * meth_repr(PyCFunctionObject *m) { if (m->m_self == NULL) return PyString_FromFormat("<built-in function %s>", m->m_ml->ml_name); return PyString_FromFormat("<built-in method %s of %s object at %p>", m->m_ml->ml_name, m->m_self->ob_type->tp_name, m->m_self); } static int 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 meth_hash(PyCFunctionObject *a) { long x,y; if (a->m_self == NULL) x = 0; else { 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; } PyTypeObject PyCFunction_Type = { PyObject_HEAD_INIT(&PyType_Type) 0, "builtin_function_or_method", sizeof(PyCFunctionObject), 0, (destructor)meth_dealloc, /* tp_dealloc */ 0, /* tp_print */ 0, /* tp_getattr */ 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 */ PyCFunction_Call, /* 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 */ 0, /* tp_doc */ (traverseproc)meth_traverse, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ 0, /* tp_methods */ meth_members, /* tp_members */ meth_getsets, /* tp_getset */ 0, /* tp_base */ 0, /* tp_dict */ }; /* List all methods in a chain -- helper for findmethodinchain */ static PyObject * listmethodchain(PyMethodChain *chain) { PyMethodChain *c; PyMethodDef *ml; int i, n; PyObject *v; n = 0; for (c = chain; c != NULL; c = c->link) { for (ml = c->methods; ml->ml_name != NULL; ml++) n++; } 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++) { PyList_SetItem(v, i, PyString_FromString(ml->ml_name)); i++; } } if (PyErr_Occurred()) { Py_DECREF(v); return NULL; } PyList_Sort(v); return v; } /* Find a method in a method chain */ PyObject * Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, const char *name) { if (name[0] == '_' && name[1] == '_') { if (strcmp(name, "__methods__") == 0) return listmethodchain(chain); if (strcmp(name, "__doc__") == 0) { const char *doc = self->ob_type->tp_doc; if (doc != NULL) return PyString_FromString(doc); } } while (chain != NULL) { 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) /* XXX */ return PyCFunction_New(ml, self); } chain = chain->link; } PyErr_SetString(PyExc_AttributeError, name); return NULL; } /* Find a method in a single method list */ PyObject * Py_FindMethod(PyMethodDef *methods, PyObject *self, const char *name) { PyMethodChain chain; chain.methods = methods; chain.link = NULL; return Py_FindMethodInChain(&chain, self, name); } /* Clear out the free list */ void PyCFunction_Fini(void) { while (free_list) { PyCFunctionObject *v = free_list; free_list = (PyCFunctionObject *)(v->m_self); PyObject_GC_Del(v); } } /* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(), but it's part of the API so we need to keep a function around that existing C extensions can call. */ #undef PyCFunction_New PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *); PyObject * PyCFunction_New(PyMethodDef *ml, PyObject *self) { return PyCFunction_NewEx(ml, self, NULL); }