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cpython/Objects/methodobject.c

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/* Method object implementation */
#include "Python.h"
#include "pycore_ceval.h" // _Py_EnterRecursiveCall()
#include "pycore_object.h"
#include "pycore_pyerrors.h"
#include "pycore_pystate.h" // _PyThreadState_GET()
#include "structmember.h" // PyMemberDef
/* undefine macro trampoline to PyCFunction_NewEx */
#undef PyCFunction_New
/* Forward declarations */
static PyObject * cfunction_vectorcall_FASTCALL(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
static PyObject * cfunction_vectorcall_FASTCALL_KEYWORDS(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
static PyObject * cfunction_vectorcall_NOARGS(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
static PyObject * cfunction_vectorcall_O(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
static PyObject * cfunction_call(
PyObject *func, PyObject *args, PyObject *kwargs);
PyObject *
PyCFunction_New(PyMethodDef *ml, PyObject *self)
{
return PyCFunction_NewEx(ml, self, NULL);
}
PyObject *
PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
{
/* Figure out correct vectorcall function to use */
vectorcallfunc vectorcall;
switch (ml->ml_flags & (METH_VARARGS | METH_FASTCALL | METH_NOARGS | METH_O | METH_KEYWORDS))
{
case METH_VARARGS:
case METH_VARARGS | METH_KEYWORDS:
/* For METH_VARARGS functions, it's more efficient to use tp_call
* instead of vectorcall. */
vectorcall = NULL;
break;
case METH_FASTCALL:
vectorcall = cfunction_vectorcall_FASTCALL;
break;
case METH_FASTCALL | METH_KEYWORDS:
vectorcall = cfunction_vectorcall_FASTCALL_KEYWORDS;
break;
case METH_NOARGS:
vectorcall = cfunction_vectorcall_NOARGS;
break;
case METH_O:
vectorcall = cfunction_vectorcall_O;
break;
default:
PyErr_Format(PyExc_SystemError,
"%s() method: bad call flags", ml->ml_name);
return NULL;
}
PyCFunctionObject *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;
op->vectorcall = vectorcall;
_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);
PyObject_GC_Del(m);
}
static PyObject *
meth_reduce(PyCFunctionObject *m, PyObject *Py_UNUSED(ignored))
{
_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), 0},
{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,
Py_TYPE(m->m_self)->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;
x = _Py_HashPointer(a->m_self);
y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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 */
offsetof(PyCFunctionObject, vectorcall), /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
(reprfunc)meth_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)meth_hash, /* tp_hash */
cfunction_call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_VECTORCALL, /* 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 */
};
/* Vectorcall functions for each of the PyCFunction calling conventions,
* except for METH_VARARGS (possibly combined with METH_KEYWORDS) which
* doesn't use vectorcall.
*
* First, common helpers
*/
static inline int
cfunction_check_kwargs(PyThreadState *tstate, PyObject *func, PyObject *kwnames)
{
assert(!_PyErr_Occurred(tstate));
assert(PyCFunction_Check(func));
if (kwnames && PyTuple_GET_SIZE(kwnames)) {
PyObject *funcstr = _PyObject_FunctionStr(func);
if (funcstr != NULL) {
_PyErr_Format(tstate, PyExc_TypeError,
"%U takes no keyword arguments", funcstr);
Py_DECREF(funcstr);
}
return -1;
}
return 0;
}
typedef void (*funcptr)(void);
static inline funcptr
cfunction_enter_call(PyThreadState *tstate, PyObject *func)
{
if (_Py_EnterRecursiveCall(tstate, " while calling a Python object")) {
return NULL;
}
return (funcptr)PyCFunction_GET_FUNCTION(func);
}
/* Now the actual vectorcall functions */
static PyObject *
cfunction_vectorcall_FASTCALL(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
{
PyThreadState *tstate = _PyThreadState_GET();
if (cfunction_check_kwargs(tstate, func, kwnames)) {
return NULL;
}
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
_PyCFunctionFast meth = (_PyCFunctionFast)
cfunction_enter_call(tstate, func);
if (meth == NULL) {
return NULL;
}
PyObject *result = meth(PyCFunction_GET_SELF(func), args, nargs);
_Py_LeaveRecursiveCall(tstate);
return result;
}
static PyObject *
cfunction_vectorcall_FASTCALL_KEYWORDS(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
{
PyThreadState *tstate = _PyThreadState_GET();
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
_PyCFunctionFastWithKeywords meth = (_PyCFunctionFastWithKeywords)
cfunction_enter_call(tstate, func);
if (meth == NULL) {
return NULL;
}
PyObject *result = meth(PyCFunction_GET_SELF(func), args, nargs, kwnames);
_Py_LeaveRecursiveCall(tstate);
return result;
}
static PyObject *
cfunction_vectorcall_NOARGS(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
{
PyThreadState *tstate = _PyThreadState_GET();
if (cfunction_check_kwargs(tstate, func, kwnames)) {
return NULL;
}
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
if (nargs != 0) {
PyObject *funcstr = _PyObject_FunctionStr(func);
if (funcstr != NULL) {
_PyErr_Format(tstate, PyExc_TypeError,
"%U takes no arguments (%zd given)", funcstr, nargs);
Py_DECREF(funcstr);
}
return NULL;
}
PyCFunction meth = (PyCFunction)cfunction_enter_call(tstate, func);
if (meth == NULL) {
return NULL;
}
PyObject *result = meth(PyCFunction_GET_SELF(func), NULL);
_Py_LeaveRecursiveCall(tstate);
return result;
}
static PyObject *
cfunction_vectorcall_O(
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
{
PyThreadState *tstate = _PyThreadState_GET();
if (cfunction_check_kwargs(tstate, func, kwnames)) {
return NULL;
}
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
if (nargs != 1) {
PyObject *funcstr = _PyObject_FunctionStr(func);
if (funcstr != NULL) {
_PyErr_Format(tstate, PyExc_TypeError,
"%U takes exactly one argument (%zd given)", funcstr, nargs);
Py_DECREF(funcstr);
}
return NULL;
}
PyCFunction meth = (PyCFunction)cfunction_enter_call(tstate, func);
if (meth == NULL) {
return NULL;
}
PyObject *result = meth(PyCFunction_GET_SELF(func), args[0]);
_Py_LeaveRecursiveCall(tstate);
return result;
}
static PyObject *
cfunction_call(PyObject *func, PyObject *args, PyObject *kwargs)
{
assert(kwargs == NULL || PyDict_Check(kwargs));
PyThreadState *tstate = _PyThreadState_GET();
assert(!_PyErr_Occurred(tstate));
int flags = PyCFunction_GET_FLAGS(func);
if (!(flags & METH_VARARGS)) {
/* If this is not a METH_VARARGS function, delegate to vectorcall */
return PyVectorcall_Call(func, args, kwargs);
}
/* For METH_VARARGS, we cannot use vectorcall as the vectorcall pointer
* is NULL. This is intentional, since vectorcall would be slower. */
PyCFunction meth = PyCFunction_GET_FUNCTION(func);
PyObject *self = PyCFunction_GET_SELF(func);
PyObject *result;
if (flags & METH_KEYWORDS) {
result = (*(PyCFunctionWithKeywords)(void(*)(void))meth)(self, args, kwargs);
}
else {
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
_PyErr_Format(tstate, PyExc_TypeError,
"%.200s() takes no keyword arguments",
((PyCFunctionObject*)func)->m_ml->ml_name);
return NULL;
}
result = meth(self, args);
}
return _Py_CheckFunctionResult(tstate, func, result, NULL);
}
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