/Objects/methodobject.c
C | 333 lines | 276 code | 41 blank | 16 comment | 46 complexity | d64e3f1bfde74e2487dcb6b0e13b81a0 MD5 | raw file
- /* Method object implementation */
- #include "Python.h"
- #include "internal/mem.h"
- #include "internal/pystate.h"
- #include "structmember.h"
- /* Free list for method objects to safe malloc/free overhead
- * The m_self element is used to chain the objects.
- */
- static PyCFunctionObject *free_list = NULL;
- static int numfree = 0;
- #ifndef PyCFunction_MAXFREELIST
- #define PyCFunction_MAXFREELIST 256
- #endif
- /* undefine macro trampoline to PyCFunction_NewEx */
- #undef PyCFunction_New
- PyAPI_FUNC(PyObject *)
- PyCFunction_New(PyMethodDef *ml, PyObject *self)
- {
- return PyCFunction_NewEx(ml, self, NULL);
- }
- PyObject *
- PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
- {
- PyCFunctionObject *op;
- op = free_list;
- if (op != NULL) {
- free_list = (PyCFunctionObject *)(op->m_self);
- (void)PyObject_INIT(op, &PyCFunction_Type);
- numfree--;
- }
- else {
- op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
- if (op == NULL)
- return NULL;
- }
- op->m_weakreflist = 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 PyCFunction_GET_FUNCTION(op);
- }
- PyObject *
- PyCFunction_GetSelf(PyObject *op)
- {
- if (!PyCFunction_Check(op)) {
- PyErr_BadInternalCall();
- return NULL;
- }
- return PyCFunction_GET_SELF(op);
- }
- int
- PyCFunction_GetFlags(PyObject *op)
- {
- if (!PyCFunction_Check(op)) {
- PyErr_BadInternalCall();
- return -1;
- }
- return PyCFunction_GET_FLAGS(op);
- }
- /* Methods (the standard built-in methods, that is) */
- static void
- meth_dealloc(PyCFunctionObject *m)
- {
- _PyObject_GC_UNTRACK(m);
- if (m->m_weakreflist != NULL) {
- PyObject_ClearWeakRefs((PyObject*) m);
- }
- Py_XDECREF(m->m_self);
- Py_XDECREF(m->m_module);
- if (numfree < PyCFunction_MAXFREELIST) {
- m->m_self = (PyObject *)free_list;
- free_list = m;
- numfree++;
- }
- else {
- PyObject_GC_Del(m);
- }
- }
- static PyObject *
- meth_reduce(PyCFunctionObject *m)
- {
- _Py_IDENTIFIER(getattr);
- if (m->m_self == NULL || PyModule_Check(m->m_self))
- return PyUnicode_FromString(m->m_ml->ml_name);
- return Py_BuildValue("N(Os)", _PyEval_GetBuiltinId(&PyId_getattr),
- m->m_self, m->m_ml->ml_name);
- }
- static PyMethodDef meth_methods[] = {
- {"__reduce__", (PyCFunction)meth_reduce, METH_NOARGS, NULL},
- {NULL, NULL}
- };
- static PyObject *
- meth_get__text_signature__(PyCFunctionObject *m, void *closure)
- {
- return _PyType_GetTextSignatureFromInternalDoc(m->m_ml->ml_name, m->m_ml->ml_doc);
- }
- static PyObject *
- meth_get__doc__(PyCFunctionObject *m, void *closure)
- {
- return _PyType_GetDocFromInternalDoc(m->m_ml->ml_name, m->m_ml->ml_doc);
- }
- static PyObject *
- meth_get__name__(PyCFunctionObject *m, void *closure)
- {
- return PyUnicode_FromString(m->m_ml->ml_name);
- }
- static PyObject *
- meth_get__qualname__(PyCFunctionObject *m, void *closure)
- {
- /* If __self__ is a module or NULL, return m.__name__
- (e.g. len.__qualname__ == 'len')
- If __self__ is a type, return m.__self__.__qualname__ + '.' + m.__name__
- (e.g. dict.fromkeys.__qualname__ == 'dict.fromkeys')
- Otherwise return type(m.__self__).__qualname__ + '.' + m.__name__
- (e.g. [].append.__qualname__ == 'list.append') */
- PyObject *type, *type_qualname, *res;
- _Py_IDENTIFIER(__qualname__);
- if (m->m_self == NULL || PyModule_Check(m->m_self))
- return PyUnicode_FromString(m->m_ml->ml_name);
- type = PyType_Check(m->m_self) ? m->m_self : (PyObject*)Py_TYPE(m->m_self);
- type_qualname = _PyObject_GetAttrId(type, &PyId___qualname__);
- if (type_qualname == NULL)
- return NULL;
- if (!PyUnicode_Check(type_qualname)) {
- PyErr_SetString(PyExc_TypeError, "<method>.__class__."
- "__qualname__ is not a unicode object");
- Py_XDECREF(type_qualname);
- return NULL;
- }
- res = PyUnicode_FromFormat("%S.%s", type_qualname, m->m_ml->ml_name);
- Py_DECREF(type_qualname);
- return res;
- }
- 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;
- self = PyCFunction_GET_SELF(m);
- 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},
- {"__qualname__", (getter)meth_get__qualname__, NULL, NULL},
- {"__self__", (getter)meth_get__self__, NULL, NULL},
- {"__text_signature__", (getter)meth_get__text_signature__, NULL, NULL},
- {0}
- };
- #define OFF(x) offsetof(PyCFunctionObject, x)
- static PyMemberDef meth_members[] = {
- {"__module__", T_OBJECT, OFF(m_module), PY_WRITE_RESTRICTED},
- {NULL}
- };
- static PyObject *
- meth_repr(PyCFunctionObject *m)
- {
- if (m->m_self == NULL || PyModule_Check(m->m_self))
- return PyUnicode_FromFormat("<built-in function %s>",
- m->m_ml->ml_name);
- return PyUnicode_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 PyObject *
- meth_richcompare(PyObject *self, PyObject *other, int op)
- {
- PyCFunctionObject *a, *b;
- PyObject *res;
- int eq;
- if ((op != Py_EQ && op != Py_NE) ||
- !PyCFunction_Check(self) ||
- !PyCFunction_Check(other))
- {
- Py_RETURN_NOTIMPLEMENTED;
- }
- a = (PyCFunctionObject *)self;
- b = (PyCFunctionObject *)other;
- eq = a->m_self == b->m_self;
- if (eq)
- eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
- if (op == Py_EQ)
- res = eq ? Py_True : Py_False;
- else
- res = eq ? Py_False : Py_True;
- Py_INCREF(res);
- return res;
- }
- static Py_hash_t
- meth_hash(PyCFunctionObject *a)
- {
- Py_hash_t 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 = {
- PyVarObject_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 */
- 0, /* tp_reserved */
- (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 */
- meth_richcompare, /* tp_richcompare */
- offsetof(PyCFunctionObject, m_weakreflist), /* tp_weaklistoffset */
- 0, /* tp_iter */
- 0, /* tp_iternext */
- meth_methods, /* tp_methods */
- meth_members, /* tp_members */
- meth_getsets, /* tp_getset */
- 0, /* tp_base */
- 0, /* tp_dict */
- };
- /* Clear out the free list */
- int
- PyCFunction_ClearFreeList(void)
- {
- int freelist_size = numfree;
- while (free_list) {
- PyCFunctionObject *v = free_list;
- free_list = (PyCFunctionObject *)(v->m_self);
- PyObject_GC_Del(v);
- numfree--;
- }
- assert(numfree == 0);
- return freelist_size;
- }
- void
- PyCFunction_Fini(void)
- {
- (void)PyCFunction_ClearFreeList();
- }
- /* Print summary info about the state of the optimized allocator */
- void
- _PyCFunction_DebugMallocStats(FILE *out)
- {
- _PyDebugAllocatorStats(out,
- "free PyCFunctionObject",
- numfree, sizeof(PyCFunctionObject));
- }