cpython/Objects/call.c at tkinter_docs · native-api/cpython · GitHub

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#include "Python.h"

#include "internal/pystate.h"

#include "frameobject.h"

int

_PyObject_HasFastCall(PyObject *callable)

{

if (PyFunction_Check(callable)) {

return 1;

}

else if (PyCFunction_Check(callable)) {

return !(PyCFunction_GET_FLAGS(callable) & METH_VARARGS);

}

else {

assert (PyCallable_Check(callable));

return 0;

}

static PyObject *

null_error(void)

{

if (!PyErr_Occurred())

PyErr_SetString(PyExc_SystemError,

"null argument to internal routine");

return NULL;

}

PyObject*

_Py_CheckFunctionResult(PyObject *callable, PyObject *result, const char *where)

{

int err_occurred = (PyErr_Occurred() != NULL);

assert((callable != NULL) ^ (where != NULL));

if (result == NULL) {

if (!err_occurred) {

if (callable)

PyErr_Format(PyExc_SystemError,

"%R returned NULL without setting an error",

callable);

else

PyErr_Format(PyExc_SystemError,

"%s returned NULL without setting an error",

where);

#ifdef Py_DEBUG

/* Ensure that the bug is caught in debug mode */

Py_FatalError("a function returned NULL without setting an error");

#endif

return NULL;

}

else {

if (err_occurred) {

Py_DECREF(result);

if (callable) {

_PyErr_FormatFromCause(PyExc_SystemError,

"%R returned a result with an error set",

callable);

}

else {

_PyErr_FormatFromCause(PyExc_SystemError,

"%s returned a result with an error set",

where);

}

#ifdef Py_DEBUG

/* Ensure that the bug is caught in debug mode */

Py_FatalError("a function returned a result with an error set");

#endif

return NULL;

}

return result;

}

/* --- Core PyObject call functions ------------------------------- */

PyObject *

_PyObject_FastCallDict(PyObject *callable, PyObject *const *args, Py_ssize_t nargs,

PyObject *kwargs)

{

/* _PyObject_FastCallDict() must not be called with an exception set,

because it can clear it (directly or indirectly) and so the

caller loses its exception */

assert(!PyErr_Occurred());

assert(callable != NULL);

assert(nargs >= 0);

assert(nargs == 0 || args != NULL);

assert(kwargs == NULL || PyDict_Check(kwargs));

if (PyFunction_Check(callable)) {

return _PyFunction_FastCallDict(callable, args, nargs, kwargs);

}

else if (PyCFunction_Check(callable)) {

return _PyCFunction_FastCallDict(callable, args, nargs, kwargs);

}

else {

PyObject *argstuple, *result;

ternaryfunc call;

/* Slow-path: build a temporary tuple */

call = callable->ob_type->tp_call;

if (call == NULL) {

PyErr_Format(PyExc_TypeError, "'%.200s' object is not callable",

callable->ob_type->tp_name);

return NULL;

}

argstuple = _PyStack_AsTuple(args, nargs);

if (argstuple == NULL) {

return NULL;

}

if (Py_EnterRecursiveCall(" while calling a Python object")) {

Py_DECREF(argstuple);

return NULL;

}

result = (*call)(callable, argstuple, kwargs);

Py_LeaveRecursiveCall();

Py_DECREF(argstuple);

result = _Py_CheckFunctionResult(callable, result, NULL);

return result;

}

PyObject *

_PyObject_FastCallKeywords(PyObject *callable, PyObject *const *stack, Py_ssize_t nargs,

PyObject *kwnames)

{

/* _PyObject_FastCallKeywords() must not be called with an exception set,

because it can clear it (directly or indirectly) and so the

caller loses its exception */

assert(!PyErr_Occurred());

assert(nargs >= 0);

assert(kwnames == NULL || PyTuple_CheckExact(kwnames));

/* kwnames must only contains str strings, no subclass, and all keys must

be unique: these checks are implemented in Python/ceval.c and

_PyArg_ParseStackAndKeywords(). */

if (PyFunction_Check(callable)) {

return _PyFunction_FastCallKeywords(callable, stack, nargs, kwnames);

}

if (PyCFunction_Check(callable)) {

return _PyCFunction_FastCallKeywords(callable, stack, nargs, kwnames);

}

else {

/* Slow-path: build a temporary tuple for positional arguments and a

temporary dictionary for keyword arguments (if any) */

ternaryfunc call;

PyObject *argstuple;

PyObject *kwdict, *result;

Py_ssize_t nkwargs;

nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);

assert((nargs == 0 && nkwargs == 0) || stack != NULL);

call = callable->ob_type->tp_call;

if (call == NULL) {

PyErr_Format(PyExc_TypeError, "'%.200s' object is not callable",

callable->ob_type->tp_name);

return NULL;

}

argstuple = _PyStack_AsTuple(stack, nargs);

if (argstuple == NULL) {

return NULL;

}

if (nkwargs > 0) {

kwdict = _PyStack_AsDict(stack + nargs, kwnames);

if (kwdict == NULL) {

Py_DECREF(argstuple);

return NULL;

}

else {

kwdict = NULL;

}

if (Py_EnterRecursiveCall(" while calling a Python object")) {

Py_DECREF(argstuple);

Py_XDECREF(kwdict);

return NULL;

}

result = (*call)(callable, argstuple, kwdict);

Py_LeaveRecursiveCall();

Py_DECREF(argstuple);

Py_XDECREF(kwdict);

result = _Py_CheckFunctionResult(callable, result, NULL);

return result;

}

PyObject *

PyObject_Call(PyObject *callable, PyObject *args, PyObject *kwargs)

{

ternaryfunc call;

PyObject *result;

/* PyObject_Call() must not be called with an exception set,

because it can clear it (directly or indirectly) and so the

caller loses its exception */

assert(!PyErr_Occurred());

assert(PyTuple_Check(args));

assert(kwargs == NULL || PyDict_Check(kwargs));

if (PyFunction_Check(callable)) {

return _PyFunction_FastCallDict(callable,

&PyTuple_GET_ITEM(args, 0),

PyTuple_GET_SIZE(args),

kwargs);

}

else if (PyCFunction_Check(callable)) {

return PyCFunction_Call(callable, args, kwargs);

}

else {

call = callable->ob_type->tp_call;

if (call == NULL) {

PyErr_Format(PyExc_TypeError, "'%.200s' object is not callable",

callable->ob_type->tp_name);

return NULL;

}

if (Py_EnterRecursiveCall(" while calling a Python object"))

return NULL;

result = (*call)(callable, args, kwargs);

Py_LeaveRecursiveCall();

return _Py_CheckFunctionResult(callable, result, NULL);

}

/* --- PyFunction call functions ---------------------------------- */

static PyObject* _Py_HOT_FUNCTION

function_code_fastcall(PyCodeObject *co, PyObject *const *args, Py_ssize_t nargs,

PyObject *globals)

{

PyFrameObject *f;

PyThreadState *tstate = PyThreadState_GET();

PyObject **fastlocals;

Py_ssize_t i;

PyObject *result;

assert(globals != NULL);

/* XXX Perhaps we should create a specialized

_PyFrame_New_NoTrack() that doesn't take locals, but does

take builtins without sanity checking them.

assert(tstate != NULL);

f = _PyFrame_New_NoTrack(tstate, co, globals, NULL);

if (f == NULL) {

return NULL;

}

fastlocals = f->f_localsplus;

for (i = 0; i < nargs; i++) {

Py_INCREF(*args);

fastlocals[i] = *args++;

}

result = PyEval_EvalFrameEx(f,0);

if (Py_REFCNT(f) > 1) {

Py_DECREF(f);

_PyObject_GC_TRACK(f);

}

else {

++tstate->recursion_depth;

Py_DECREF(f);

--tstate->recursion_depth;

}

return result;

}

PyObject *

_PyFunction_FastCallDict(PyObject *func, PyObject *const *args, Py_ssize_t nargs,

PyObject *kwargs)

{

PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);

PyObject *globals = PyFunction_GET_GLOBALS(func);

PyObject *argdefs = PyFunction_GET_DEFAULTS(func);

PyObject *kwdefs, *closure, *name, *qualname;

PyObject *kwtuple, **k;

PyObject **d;

Py_ssize_t nd, nk;

PyObject *result;

assert(func != NULL);

assert(nargs >= 0);

assert(nargs == 0 || args != NULL);

assert(kwargs == NULL || PyDict_Check(kwargs));

if (co->co_kwonlyargcount == 0 &&

(kwargs == NULL || PyDict_GET_SIZE(kwargs) == 0) &&

(co->co_flags & ~PyCF_MASK) == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE))

{

/* Fast paths */

if (argdefs == NULL && co->co_argcount == nargs) {

return function_code_fastcall(co, args, nargs, globals);

}

else if (nargs == 0 && argdefs != NULL

&& co->co_argcount == PyTuple_GET_SIZE(argdefs)) {

/* function called with no arguments, but all parameters have

a default value: use default values as arguments .*/

args = &PyTuple_GET_ITEM(argdefs, 0);

return function_code_fastcall(co, args, PyTuple_GET_SIZE(argdefs),

globals);

}

nk = (kwargs != NULL) ? PyDict_GET_SIZE(kwargs) : 0;

if (nk != 0) {

Py_ssize_t pos, i;

/* bpo-29318, bpo-27840: Caller and callee functions must not share

the dictionary: kwargs must be copied. */

kwtuple = PyTuple_New(2 * nk);

if (kwtuple == NULL) {

return NULL;

}

k = &PyTuple_GET_ITEM(kwtuple, 0);

pos = i = 0;

while (PyDict_Next(kwargs, &pos, &k[i], &k[i+1])) {

/* We must hold strong references because keyword arguments can be

indirectly modified while the function is called:

see issue #2016 and test_extcall */

Py_INCREF(k[i]);

Py_INCREF(k[i+1]);

i += 2;

}

nk = i / 2;

}

else {

kwtuple = NULL;

k = NULL;

}

kwdefs = PyFunction_GET_KW_DEFAULTS(func);

closure = PyFunction_GET_CLOSURE(func);

name = ((PyFunctionObject *)func) -> func_name;

qualname = ((PyFunctionObject *)func) -> func_qualname;

if (argdefs != NULL) {

d = &PyTuple_GET_ITEM(argdefs, 0);

nd = PyTuple_GET_SIZE(argdefs);

}

else {

d = NULL;

nd = 0;

}

result = _PyEval_EvalCodeWithName((PyObject*)co, globals, (PyObject *)NULL,

args, nargs,

k, k != NULL ? k + 1 : NULL, nk, 2,

d, nd, kwdefs,

closure, name, qualname);

Py_XDECREF(kwtuple);

return result;

}

PyObject *

_PyFunction_FastCallKeywords(PyObject *func, PyObject *const *stack,

Py_ssize_t nargs, PyObject *kwnames)

{

PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);

PyObject *globals = PyFunction_GET_GLOBALS(func);

PyObject *argdefs = PyFunction_GET_DEFAULTS(func);

PyObject *kwdefs, *closure, *name, *qualname;

PyObject **d;

Py_ssize_t nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);

Py_ssize_t nd;

assert(PyFunction_Check(func));

assert(nargs >= 0);

assert(kwnames == NULL || PyTuple_CheckExact(kwnames));

assert((nargs == 0 && nkwargs == 0) || stack != NULL);

/* kwnames must only contains str strings, no subclass, and all keys must

be unique */

if (co->co_kwonlyargcount == 0 && nkwargs == 0 &&

(co->co_flags & ~PyCF_MASK) == (CO_OPTIMIZED | CO_NEWLOCALS | CO_NOFREE))

{

if (argdefs == NULL && co->co_argcount == nargs) {

return function_code_fastcall(co, stack, nargs, globals);

}

else if (nargs == 0 && argdefs != NULL

&& co->co_argcount == PyTuple_GET_SIZE(argdefs)) {

/* function called with no arguments, but all parameters have

a default value: use default values as arguments .*/

stack = &PyTuple_GET_ITEM(argdefs, 0);

return function_code_fastcall(co, stack, PyTuple_GET_SIZE(argdefs),

globals);

}

kwdefs = PyFunction_GET_KW_DEFAULTS(func);

closure = PyFunction_GET_CLOSURE(func);

name = ((PyFunctionObject *)func) -> func_name;

qualname = ((PyFunctionObject *)func) -> func_qualname;

if (argdefs != NULL) {

d = &PyTuple_GET_ITEM(argdefs, 0);

nd = PyTuple_GET_SIZE(argdefs);

}

else {

d = NULL;

nd = 0;

}

return _PyEval_EvalCodeWithName((PyObject*)co, globals, (PyObject *)NULL,

stack, nargs,

nkwargs ? &PyTuple_GET_ITEM(kwnames, 0) : NULL,

stack + nargs,

nkwargs, 1,

d, (int)nd, kwdefs,

closure, name, qualname);

}

/* --- PyCFunction call functions --------------------------------- */

PyObject *

_PyMethodDef_RawFastCallDict(PyMethodDef *method, PyObject *self,

PyObject *const *args, Py_ssize_t nargs,

PyObject *kwargs)

{

/* _PyMethodDef_RawFastCallDict() must not be called with an exception set,

because it can clear it (directly or indirectly) and so the

caller loses its exception */

assert(!PyErr_Occurred());

assert(method != NULL);

assert(nargs >= 0);

assert(nargs == 0 || args != NULL);

assert(kwargs == NULL || PyDict_Check(kwargs));

PyCFunction meth = method->ml_meth;

int flags = method->ml_flags & ~(METH_CLASS | METH_STATIC | METH_COEXIST);

PyObject *result = NULL;

if (Py_EnterRecursiveCall(" while calling a Python object")) {

return NULL;

}

switch (flags)

{

case METH_NOARGS:

if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {

goto no_keyword_error;

}

if (nargs != 0) {

PyErr_Format(PyExc_TypeError,

"%.200s() takes no arguments (%zd given)",

method->ml_name, nargs);

goto exit;

}

result = (*meth) (self, NULL);

break;

case METH_O:

if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {

goto no_keyword_error;

}

if (nargs != 1) {

PyErr_Format(PyExc_TypeError,

"%.200s() takes exactly one argument (%zd given)",

method->ml_name, nargs);

goto exit;

}

result = (*meth) (self, args[0]);

break;

case METH_VARARGS:

if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {

goto no_keyword_error;

}

/* fall through */

case METH_VARARGS | METH_KEYWORDS:

{

/* Slow-path: create a temporary tuple for positional arguments */

PyObject *argstuple = _PyStack_AsTuple(args, nargs);

if (argstuple == NULL) {

goto exit;

}

if (flags & METH_KEYWORDS) {

result = (*(PyCFunctionWithKeywords)meth) (self, argstuple, kwargs);

}

else {

result = (*meth) (self, argstuple);

}

Py_DECREF(argstuple);

break;

}

case METH_FASTCALL:

{

if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {

goto no_keyword_error;

}

result = (*(_PyCFunctionFast)meth) (self, args, nargs);

break;

}

case METH_FASTCALL | METH_KEYWORDS:

{

PyObject *const *stack;

PyObject *kwnames;

_PyCFunctionFastWithKeywords fastmeth = (_PyCFunctionFastWithKeywords)meth;

if (_PyStack_UnpackDict(args, nargs, kwargs, &stack, &kwnames) < 0) {

goto exit;

}

result = (*fastmeth) (self, stack, nargs, kwnames);

if (stack != args) {

PyMem_Free((PyObject **)stack);

}

Py_XDECREF(kwnames);

break;

}

default:

PyErr_SetString(PyExc_SystemError,

"Bad call flags in _PyMethodDef_RawFastCallDict. "

"METH_OLDARGS is no longer supported!");

goto exit;

}

goto exit;

no_keyword_error:

PyErr_Format(PyExc_TypeError,

"%.200s() takes no keyword arguments",

method->ml_name);

exit:

Py_LeaveRecursiveCall();

return result;

}

PyObject *

_PyCFunction_FastCallDict(PyObject *func,

PyObject *const *args, Py_ssize_t nargs,

PyObject *kwargs)

{

PyObject *result;

assert(func != NULL);

assert(PyCFunction_Check(func));

result = _PyMethodDef_RawFastCallDict(((PyCFunctionObject*)func)->m_ml,

PyCFunction_GET_SELF(func),

args, nargs, kwargs);

result = _Py_CheckFunctionResult(func, result, NULL);

return result;

}

PyObject *

_PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self,

PyObject *const *args, Py_ssize_t nargs,

PyObject *kwnames)

{

/* _PyMethodDef_RawFastCallKeywords() must not be called with an exception set,

because it can clear it (directly or indirectly) and so the

caller loses its exception */

assert(!PyErr_Occurred());

assert(method != NULL);

assert(nargs >= 0);

assert(kwnames == NULL || PyTuple_CheckExact(kwnames));

/* kwnames must only contains str strings, no subclass, and all keys must

be unique */

PyCFunction meth = method->ml_meth;

int flags = method->ml_flags & ~(METH_CLASS | METH_STATIC | METH_COEXIST);

Py_ssize_t nkwargs = kwnames == NULL ? 0 : PyTuple_GET_SIZE(kwnames);

PyObject *result = NULL;

if (Py_EnterRecursiveCall(" while calling a Python object")) {

return NULL;

}

switch (flags)

{

case METH_NOARGS:

if (nkwargs) {

goto no_keyword_error;

}

if (nargs != 0) {

PyErr_Format(PyExc_TypeError,

"%.200s() takes no arguments (%zd given)",

method->ml_name, nargs);

goto exit;

}

result = (*meth) (self, NULL);

break;

case METH_O:

if (nkwargs) {

goto no_keyword_error;

}

if (nargs != 1) {

PyErr_Format(PyExc_TypeError,

"%.200s() takes exactly one argument (%zd given)",

method->ml_name, nargs);

goto exit;

}

result = (*meth) (self, args[0]);

break;

case METH_FASTCALL:

if (nkwargs) {

goto no_keyword_error;

}

result = ((_PyCFunctionFast)meth) (self, args, nargs);

break;

case METH_FASTCALL | METH_KEYWORDS:

/* Fast-path: avoid temporary dict to pass keyword arguments */

result = ((_PyCFunctionFastWithKeywords)meth) (self, args, nargs, kwnames);

break;

case METH_VARARGS:

if (nkwargs) {

goto no_keyword_error;

}

/* fall through */

case METH_VARARGS | METH_KEYWORDS:

{

/* Slow-path: create a temporary tuple for positional arguments

and a temporary dict for keyword arguments */

PyObject *argtuple;

argtuple = _PyStack_AsTuple(args, nargs);

if (argtuple == NULL) {

goto exit;

}

if (flags & METH_KEYWORDS) {

PyObject *kwdict;

if (nkwargs > 0) {

kwdict = _PyStack_AsDict(args + nargs, kwnames);

if (kwdict == NULL) {

Py_DECREF(argtuple);

goto exit;

}

else {

kwdict = NULL;

}

result = (*(PyCFunctionWithKeywords)meth) (self, argtuple, kwdict);

Py_XDECREF(kwdict);

}

else {

result = (*meth) (self, argtuple);

}

Py_DECREF(argtuple);

break;

}

default:

PyErr_SetString(PyExc_SystemError,

"Bad call flags in _PyCFunction_FastCallKeywords. "

"METH_OLDARGS is no longer supported!");

goto exit;

}

goto exit;

no_keyword_error:

PyErr_Format(PyExc_TypeError,

"%.200s() takes no keyword arguments",

method->ml_name);

exit:

Py_LeaveRecursiveCall();

return result;

}

PyObject *

_PyCFunction_FastCallKeywords(PyObject *func,

PyObject *const *args, Py_ssize_t nargs,

PyObject *kwnames)

{

PyObject *result;

assert(func != NULL);

assert(PyCFunction_Check(func));

result = _PyMethodDef_RawFastCallKeywords(((PyCFunctionObject*)func)->m_ml,

PyCFunction_GET_SELF(func),

args, nargs, kwnames);

result = _Py_CheckFunctionResult(func, result, NULL);

return result;

}

static PyObject *

cfunction_call_varargs(PyObject *func, PyObject *args, PyObject *kwargs)

{

assert(!PyErr_Occurred());

assert(kwargs == NULL || PyDict_Check(kwargs));

PyCFunction meth = PyCFunction_GET_FUNCTION(func);

PyObject *self = PyCFunction_GET_SELF(func);

PyObject *result;

if (PyCFunction_GET_FLAGS(func) & METH_KEYWORDS) {

if (Py_EnterRecursiveCall(" while calling a Python object")) {

return NULL;

}

result = (*(PyCFunctionWithKeywords)meth)(self, args, kwargs);

Py_LeaveRecursiveCall();

}

else {

if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {

PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",

((PyCFunctionObject*)func)->m_ml->ml_name);

return NULL;

}

if (Py_EnterRecursiveCall(" while calling a Python object")) {

return NULL;

}

result = (*meth)(self, args);

Py_LeaveRecursiveCall();

}

return _Py_CheckFunctionResult(func, result, NULL);

}

PyObject *

PyCFunction_Call(PyObject *func, PyObject *args, PyObject *kwargs)

{

/* first try METH_VARARGS to pass directly args tuple unchanged.

_PyMethodDef_RawFastCallDict() creates a new temporary tuple

for METH_VARARGS. */

if (PyCFunction_GET_FLAGS(func) & METH_VARARGS) {

return cfunction_call_varargs(func, args, kwargs);

}

else {

return _PyCFunction_FastCallDict(func,

&PyTuple_GET_ITEM(args, 0),

PyTuple_GET_SIZE(args),

kwargs);

}

/* --- More complex call functions -------------------------------- */

/* External interface to call any callable object.

The args must be a tuple or NULL. The kwargs must be a dict or NULL. */

PyObject *

PyEval_CallObjectWithKeywords(PyObject *callable,

PyObject *args, PyObject *kwargs)

{

#ifdef Py_DEBUG

/* PyEval_CallObjectWithKeywords() must not be called with an exception

set. It raises a new exception if parameters are invalid or if

PyTuple_New() fails, and so the original exception is lost. */

assert(!PyErr_Occurred());

#endif

if (args != NULL && !PyTuple_Check(args)) {

PyErr_SetString(PyExc_TypeError,

"argument list must be a tuple");

return NULL;

}

if (kwargs != NULL && !PyDict_Check(kwargs)) {

PyErr_SetString(PyExc_TypeError,

"keyword list must be a dictionary");

return NULL;

}

if (args == NULL) {

return _PyObject_FastCallDict(callable, NULL, 0, kwargs);

}

else {

return PyObject_Call(callable, args, kwargs);

}

PyObject *

PyObject_CallObject(PyObject *callable, PyObject *args)

{

return PyEval_CallObjectWithKeywords(callable, args, NULL);

}

/* Positional arguments are obj followed by args:

call callable(obj, *args, **kwargs) */

PyObject *

_PyObject_FastCall_Prepend(PyObject *callable, PyObject *obj,

PyObject *const *args, Py_ssize_t nargs)

{

PyObject *small_stack[_PY_FASTCALL_SMALL_STACK];

PyObject **args2;

PyObject *result;

nargs++;

if (nargs <= (Py_ssize_t)Py_ARRAY_LENGTH(small_stack)) {

args2 = small_stack;

}

else {

args2 = PyMem_Malloc(nargs * sizeof(PyObject *));

if (args2 == NULL) {

PyErr_NoMemory();

return NULL;

}

/* use borrowed references */

args2[0] = obj;

if (nargs > 1) {

memcpy(&args2[1], args, (nargs - 1) * sizeof(PyObject *));

}

result = _PyObject_FastCall(callable, args2, nargs);

if (args2 != small_stack) {

PyMem_Free(args2);

}

return result;

}

/* Call callable(obj, *args, **kwargs). */

PyObject *

_PyObject_Call_Prepend(PyObject *callable,

PyObject *obj, PyObject *args, PyObject *kwargs)

{

PyObject *small_stack[_PY_FASTCALL_SMALL_STACK];

PyObject **stack;

Py_ssize_t argcount;

PyObject *result;

assert(PyTuple_Check(args));

argcount = PyTuple_GET_SIZE(args);

if (argcount + 1 <= (Py_ssize_t)Py_ARRAY_LENGTH(small_stack)) {

stack = small_stack;

}

else {

stack = PyMem_Malloc((argcount + 1) * sizeof(PyObject *));

if (stack == NULL) {

PyErr_NoMemory();

return NULL;

}

/* use borrowed references */

stack[0] = obj;

memcpy(&stack[1],

&PyTuple_GET_ITEM(args, 0),

argcount * sizeof(PyObject *));

result = _PyObject_FastCallDict(callable,

stack, argcount + 1,

kwargs);

if (stack != small_stack) {

PyMem_Free(stack);

}

return result;

}

/* --- Call with a format string ---------------------------------- */

static PyObject *

_PyObject_CallFunctionVa(PyObject *callable, const char *format,

va_list va, int is_size_t)

{

PyObject* small_stack[_PY_FASTCALL_SMALL_STACK];

const Py_ssize_t small_stack_len = Py_ARRAY_LENGTH(small_stack);

PyObject **stack;

Py_ssize_t nargs, i;

PyObject *result;

if (callable == NULL) {

return null_error();

}

if (!format || !*format) {

return _PyObject_CallNoArg(callable);

}

if (is_size_t) {

stack = _Py_VaBuildStack_SizeT(small_stack, small_stack_len,

format, va, &nargs);

}

else {

stack = _Py_VaBuildStack(small_stack, small_stack_len,

format, va, &nargs);

}

if (stack == NULL) {

return NULL;

}

if (nargs == 1 && PyTuple_Check(stack[0])) {

/* Special cases for backward compatibility:

- PyObject_CallFunction(func, "O", tuple) calls func(*tuple)

- PyObject_CallFunction(func, "(OOO)", arg1, arg2, arg3) calls

func(*(arg1, arg2, arg3)): func(arg1, arg2, arg3) */

PyObject *args = stack[0];

result = _PyObject_FastCall(callable,

&PyTuple_GET_ITEM(args, 0),

PyTuple_GET_SIZE(args));

}

else {

result = _PyObject_FastCall(callable, stack, nargs);

}

for (i = 0; i < nargs; ++i) {

Py_DECREF(stack[i]);

}

if (stack != small_stack) {

PyMem_Free(stack);

}

return result;

}

PyObject *

PyObject_CallFunction(PyObject *callable, const char *format, ...)

{

va_list va;

PyObject *result;

va_start(va, format);

result = _PyObject_CallFunctionVa(callable, format, va, 0);

va_end(va);

return result;

}

/* PyEval_CallFunction is exact copy of PyObject_CallFunction.

* This function is kept for backward compatibility.

PyObject *

PyEval_CallFunction(PyObject *callable, const char *format, ...)

{

va_list va;

PyObject *result;

va_start(va, format);

result = _PyObject_CallFunctionVa(callable, format, va, 0);

va_end(va);

return result;

}

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cpython/Objects/call.c at tkinter_docs · native-api/cpython · GitHub

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