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/* Method object implementation */

#include "Python.h"

#include "pycore_call.h" // _Py_CheckFunctionResult()

#include "pycore_ceval.h" // _Py_EnterRecursiveCallTstate()

#include "pycore_freelist.h"

#include "pycore_object.h"

#include "pycore_pyerrors.h"

#include "pycore_pystate.h" // _PyThreadState_GET()

#include "pycore_weakref.h" // FT_CLEAR_WEAKREFS()

/* undefine macro trampoline to PyCFunction_NewEx */

#undef PyCFunction_New

/* undefine macro trampoline to PyCMethod_New */

#undef PyCFunction_NewEx

/* 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_FASTCALL_KEYWORDS_METHOD(

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)

{

return PyCMethod_New(ml, self, module, NULL);

}

PyObject *

PyCMethod_New(PyMethodDef *ml, PyObject *self, PyObject *module, PyTypeObject *cls)

{

/* Figure out correct vectorcall function to use */

vectorcallfunc vectorcall;

switch (ml->ml_flags & _Py_METH_CALL_FLAGS)

{

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;

case METH_METHOD | METH_FASTCALL | METH_KEYWORDS:

vectorcall = cfunction_vectorcall_FASTCALL_KEYWORDS_METHOD;

break;

default:

PyErr_Format(PyExc_SystemError,

"%s() method: bad call flags", ml->ml_name);

return NULL;

}

PyCFunctionObject *op = NULL;

if (ml->ml_flags & METH_METHOD) {

if (!cls) {

PyErr_SetString(PyExc_SystemError,

"attempting to create PyCMethod with a METH_METHOD "

"flag but no class");

return NULL;

}

PyCMethodObject *om = _Py_FREELIST_POP(PyCMethodObject, pycmethodobject);

if (om == NULL) {

om = PyObject_GC_New(PyCMethodObject, &PyCMethod_Type);

if (om == NULL) {

return NULL;

}

om->mm_class = (PyTypeObject*)Py_NewRef(cls);

op = (PyCFunctionObject *)om;

} else {

if (cls) {

PyErr_SetString(PyExc_SystemError,

"attempting to create PyCFunction with class "

"but no METH_METHOD flag");

return NULL;

}

op = _Py_FREELIST_POP(PyCFunctionObject, pycfunctionobject);

if (op == NULL) {

op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);

if (op == NULL) {

return NULL;

}

op->m_weakreflist = NULL;

op->m_ml = ml;

op->m_self = Py_XNewRef(self);

op->m_module = Py_XNewRef(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);

}

PyTypeObject *

PyCMethod_GetClass(PyObject *op)

{

if (!PyCFunction_Check(op)) {

PyErr_BadInternalCall();

return NULL;

}

return PyCFunction_GET_CLASS(op);

}

/* Methods (the standard built-in methods, that is) */

static void

meth_dealloc(PyObject *self)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

PyObject_GC_UnTrack(m);

FT_CLEAR_WEAKREFS(self, m->m_weakreflist);

// We need to access ml_flags here rather than later.

// `m->m_ml` might have the same lifetime

// as `m_self` when it's dynamically allocated.

int ml_flags = m->m_ml->ml_flags;

// Dereference class before m_self: PyCFunction_GET_CLASS accesses

// PyMethodDef m_ml, which could be kept alive by m_self

Py_XDECREF(PyCFunction_GET_CLASS(m));

Py_XDECREF(m->m_self);

Py_XDECREF(m->m_module);

if (ml_flags & METH_METHOD) {

assert(Py_IS_TYPE(self, &PyCMethod_Type));

_Py_FREELIST_FREE(pycmethodobject, m, PyObject_GC_Del);

}

else {

assert(Py_IS_TYPE(self, &PyCFunction_Type));

_Py_FREELIST_FREE(pycfunctionobject, m, PyObject_GC_Del);

}

static PyObject *

meth_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

if (m->m_self == NULL || PyModule_Check(m->m_self))

return PyUnicode_FromString(m->m_ml->ml_name);

return Py_BuildValue("N(Os)", _PyEval_GetBuiltin(&_Py_ID(getattr)),

m->m_self, m->m_ml->ml_name);

}

static PyMethodDef meth_methods[] = {

{"__reduce__", meth_reduce, METH_NOARGS, NULL},

{NULL, NULL}

};

static PyObject *

meth_get__text_signature__(PyObject *self, void *closure)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

return _PyType_GetTextSignatureFromInternalDoc(m->m_ml->ml_name,

m->m_ml->ml_doc,

m->m_ml->ml_flags);

}

static PyObject *

meth_get__doc__(PyObject *self, void *closure)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

return _PyType_GetDocFromInternalDoc(m->m_ml->ml_name, m->m_ml->ml_doc);

}

static PyObject *

meth_get__name__(PyObject *self, void *closure)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

return PyUnicode_FromString(m->m_ml->ml_name);

}

static PyObject *

meth_get__qualname__(PyObject *self, 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') */

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

if (m->m_self == NULL || PyModule_Check(m->m_self)) {

return PyUnicode_FromString(m->m_ml->ml_name);

}

PyObject *type = PyType_Check(m->m_self) ? m->m_self : (PyObject*)Py_TYPE(m->m_self);

PyObject *type_qualname = PyObject_GetAttr(type, &_Py_ID(__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;

}

PyObject *res = PyUnicode_FromFormat("%S.%s", type_qualname, m->m_ml->ml_name);

Py_DECREF(type_qualname);

return res;

}

static int

meth_traverse(PyObject *self, visitproc visit, void *arg)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

Py_VISIT(PyCFunction_GET_CLASS(m));

Py_VISIT(m->m_self);

Py_VISIT(m->m_module);

return 0;

}

static PyObject *

meth_get__self__(PyObject *meth, void *closure)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(meth);

PyObject *self = PyCFunction_GET_SELF(m);

if (self == NULL) {

self = Py_None;

}

return Py_NewRef(self);

}

static PyGetSetDef meth_getsets[] = {

{"__doc__", meth_get__doc__, NULL, NULL},

{"__name__", meth_get__name__, NULL, NULL},

{"__qualname__", meth_get__qualname__, NULL, NULL},

{"__self__", meth_get__self__, NULL, NULL},

{"__text_signature__", meth_get__text_signature__, NULL, NULL},

{0}

};

#define OFF(x) offsetof(PyCFunctionObject, x)

static PyMemberDef meth_members[] = {

{"__module__", _Py_T_OBJECT, OFF(m_module), 0},

{NULL}

};

static PyObject *

meth_repr(PyObject *self)

{

PyCFunctionObject *m = _PyCFunctionObject_CAST(self);

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;

return Py_NewRef(res);

}

static Py_hash_t

meth_hash(PyObject *self)

{

PyCFunctionObject *a = _PyCFunctionObject_CAST(self);

Py_hash_t x = PyObject_GenericHash(a->m_self);

Py_hash_t 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),

meth_dealloc, /* tp_dealloc */

offsetof(PyCFunctionObject, vectorcall), /* tp_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

meth_repr, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

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 */

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 */

};

PyTypeObject PyCMethod_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

.tp_name = "builtin_method",

.tp_basicsize = sizeof(PyCMethodObject),

.tp_base = &PyCFunction_Type,

};

/* 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_EnterRecursiveCallTstate(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_LeaveRecursiveCallTstate(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_LeaveRecursiveCallTstate(tstate);

return result;

}

static PyObject *

cfunction_vectorcall_FASTCALL_KEYWORDS_METHOD(

PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)

{

PyThreadState *tstate = _PyThreadState_GET();

PyTypeObject *cls = PyCFunction_GET_CLASS(func);

Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);

PyCMethod meth = (PyCMethod)cfunction_enter_call(tstate, func);

if (meth == NULL) {

return NULL;

}

PyObject *result = meth(PyCFunction_GET_SELF(func), cls, args, nargs, kwnames);

_Py_LeaveRecursiveCallTstate(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 = _PyCFunction_TrampolineCall(

meth, PyCFunction_GET_SELF(func), NULL);

_Py_LeaveRecursiveCallTstate(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 = _PyCFunction_TrampolineCall(

meth, PyCFunction_GET_SELF(func), args[0]);

_Py_LeaveRecursiveCallTstate(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_TrampolineCall(

*_PyCFunctionWithKeywords_CAST(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 = _PyCFunction_TrampolineCall(meth, self, args);

}

return _Py_CheckFunctionResult(tstate, func, result, NULL);

}

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