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cpython/Objects/call.c

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#include "Python.h"
#include "pycore_object.h"
#include "pycore_pystate.h"
#include "pycore_tupleobject.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 = _PyTuple_FromArray(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 = _PyTuple_FromArray(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_ITEMS(args),
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 + co->co_posonlyargcount == nargs) {
return function_code_fastcall(co, args, nargs, globals);
}
else if (nargs == 0 && argdefs != NULL
&& co->co_argcount + co->co_posonlyargcount == PyTuple_GET_SIZE(argdefs)) {
/* function called with no arguments, but all parameters have
a default value: use default values as arguments .*/
args = _PyTuple_ITEMS(argdefs);
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_ITEMS(kwtuple);
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;
}
assert(i / 2 == nk);
}
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_ITEMS(argdefs);
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 + co->co_posonlyargcount== nargs) {
return function_code_fastcall(co, stack, nargs, globals);
}
else if (nargs == 0 && argdefs != NULL
&& co->co_argcount + co->co_posonlyargcount == PyTuple_GET_SIZE(argdefs)) {
/* function called with no arguments, but all parameters have
a default value: use default values as arguments .*/
stack = _PyTuple_ITEMS(argdefs);
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_ITEMS(argdefs);
nd = PyTuple_GET_SIZE(argdefs);
}
else {
d = NULL;
nd = 0;
}
return _PyEval_EvalCodeWithName((PyObject*)co, globals, (PyObject *)NULL,
stack, nargs,
nkwargs ? _PyTuple_ITEMS(kwnames) : 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 = _PyTuple_FromArray(args, nargs);
if (argstuple == NULL) {
goto exit;
}
if (flags & METH_KEYWORDS) {
result = (*(PyCFunctionWithKeywords)(void(*)(void))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)(void(*)(void))meth) (self, args, nargs);
break;
}
case METH_FASTCALL | METH_KEYWORDS:
{
PyObject *const *stack;
PyObject *kwnames;
_PyCFunctionFastWithKeywords fastmeth = (_PyCFunctionFastWithKeywords)(void(*)(void))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)(void(*)(void))meth) (self, args, nargs);
break;
case METH_FASTCALL | METH_KEYWORDS:
/* Fast-path: avoid temporary dict to pass keyword arguments */
result = ((_PyCFunctionFastWithKeywords)(void(*)(void))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 = _PyTuple_FromArray(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)(void(*)(void))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)(void(*)(void))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_ITEMS(args),
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_ITEMS(args),
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_ITEMS(args),
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;
}
PyObject *
_PyObject_CallFunction_SizeT(PyObject *callable, const char *format, ...)
{
va_list va;
PyObject *result;
va_start(va, format);
result = _PyObject_CallFunctionVa(callable, format, va, 1);
va_end(va);
return result;
}
static PyObject*
callmethod(PyObject* callable, const char *format, va_list va, int is_size_t)
{
assert(callable != NULL);
if (!PyCallable_Check(callable)) {
PyErr_Format(PyExc_TypeError,
"attribute of type '%.200s' is not callable",
Py_TYPE(callable)->tp_name);
return NULL;
}
return _PyObject_CallFunctionVa(callable, format, va, is_size_t);
}
PyObject *
PyObject_CallMethod(PyObject *obj, const char *name, const char *format, ...)
{
va_list va;
PyObject *callable, *retval;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = PyObject_GetAttrString(obj, name);
if (callable == NULL)
return NULL;
va_start(va, format);
retval = callmethod(callable, format, va, 0);
va_end(va);
Py_DECREF(callable);
return retval;
}
/* PyEval_CallMethod is exact copy of PyObject_CallMethod.
* This function is kept for backward compatibility.
*/
PyObject *
PyEval_CallMethod(PyObject *obj, const char *name, const char *format, ...)
{
va_list va;
PyObject *callable, *retval;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = PyObject_GetAttrString(obj, name);
if (callable == NULL)
return NULL;
va_start(va, format);
retval = callmethod(callable, format, va, 0);
va_end(va);
Py_DECREF(callable);
return retval;
}
PyObject *
_PyObject_CallMethodId(PyObject *obj, _Py_Identifier *name,
const char *format, ...)
{
va_list va;
PyObject *callable, *retval;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = _PyObject_GetAttrId(obj, name);
if (callable == NULL)
return NULL;
va_start(va, format);
retval = callmethod(callable, format, va, 0);
va_end(va);
Py_DECREF(callable);
return retval;
}
PyObject *
_PyObject_CallMethod_SizeT(PyObject *obj, const char *name,
const char *format, ...)
{
va_list va;
PyObject *callable, *retval;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = PyObject_GetAttrString(obj, name);
if (callable == NULL)
return NULL;
va_start(va, format);
retval = callmethod(callable, format, va, 1);
va_end(va);
Py_DECREF(callable);
return retval;
}
PyObject *
_PyObject_CallMethodId_SizeT(PyObject *obj, _Py_Identifier *name,
const char *format, ...)
{
va_list va;
PyObject *callable, *retval;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = _PyObject_GetAttrId(obj, name);
if (callable == NULL) {
return NULL;
}
va_start(va, format);
retval = callmethod(callable, format, va, 1);
va_end(va);
Py_DECREF(callable);
return retval;
}
/* --- Call with "..." arguments ---------------------------------- */
static PyObject *
object_vacall(PyObject *callable, va_list vargs)
{
PyObject *small_stack[_PY_FASTCALL_SMALL_STACK];
PyObject **stack;
Py_ssize_t nargs;
PyObject *result;
Py_ssize_t i;
va_list countva;
if (callable == NULL) {
return null_error();
}
/* Count the number of arguments */
va_copy(countva, vargs);
nargs = 0;
while (1) {
PyObject *arg = va_arg(countva, PyObject *);
if (arg == NULL) {
break;
}
nargs++;
}
va_end(countva);
/* Copy arguments */
if (nargs <= (Py_ssize_t)Py_ARRAY_LENGTH(small_stack)) {
stack = small_stack;
}
else {
stack = PyMem_Malloc(nargs * sizeof(stack[0]));
if (stack == NULL) {
PyErr_NoMemory();
return NULL;
}
}
for (i = 0; i < nargs; ++i) {
stack[i] = va_arg(vargs, PyObject *);
}
/* Call the function */
result = _PyObject_FastCall(callable, stack, nargs);
if (stack != small_stack) {
PyMem_Free(stack);
}
return result;
}
PyObject *
PyObject_CallMethodObjArgs(PyObject *callable, PyObject *name, ...)
{
va_list vargs;
PyObject *result;
if (callable == NULL || name == NULL) {
return null_error();
}
callable = PyObject_GetAttr(callable, name);
if (callable == NULL) {
return NULL;
}
va_start(vargs, name);
result = object_vacall(callable, vargs);
va_end(vargs);
Py_DECREF(callable);
return result;
}
PyObject *
_PyObject_CallMethodIdObjArgs(PyObject *obj,
struct _Py_Identifier *name, ...)
{
va_list vargs;
PyObject *callable, *result;
if (obj == NULL || name == NULL) {
return null_error();
}
callable = _PyObject_GetAttrId(obj, name);
if (callable == NULL) {
return NULL;
}
va_start(vargs, name);
result = object_vacall(callable, vargs);
va_end(vargs);
Py_DECREF(callable);
return result;
}
PyObject *
PyObject_CallFunctionObjArgs(PyObject *callable, ...)
{
va_list vargs;
PyObject *result;
va_start(vargs, callable);
result = object_vacall(callable, vargs);
va_end(vargs);
return result;
}
/* --- PyStack functions ------------------------------------------ */
PyObject *
_PyStack_AsDict(PyObject *const *values, PyObject *kwnames)
{
Py_ssize_t nkwargs;
PyObject *kwdict;
Py_ssize_t i;
assert(kwnames != NULL);
nkwargs = PyTuple_GET_SIZE(kwnames);
kwdict = _PyDict_NewPresized(nkwargs);
if (kwdict == NULL) {
return NULL;
}
for (i = 0; i < nkwargs; i++) {
PyObject *key = PyTuple_GET_ITEM(kwnames, i);
PyObject *value = *values++;
/* If key already exists, replace it with the new value */
if (PyDict_SetItem(kwdict, key, value)) {
Py_DECREF(kwdict);
return NULL;
}
}
return kwdict;
}
int
_PyStack_UnpackDict(PyObject *const *args, Py_ssize_t nargs, PyObject *kwargs,
PyObject *const **p_stack, PyObject **p_kwnames)
{
PyObject **stack, **kwstack;
Py_ssize_t nkwargs;
Py_ssize_t pos, i;
PyObject *key, *value;
PyObject *kwnames;
assert(nargs >= 0);
assert(kwargs == NULL || PyDict_CheckExact(kwargs));
if (kwargs == NULL || (nkwargs = PyDict_GET_SIZE(kwargs)) == 0) {
*p_stack = args;
*p_kwnames = NULL;
return 0;
}
if ((size_t)nargs > PY_SSIZE_T_MAX / sizeof(stack[0]) - (size_t)nkwargs) {
PyErr_NoMemory();
return -1;
}
stack = PyMem_Malloc((nargs + nkwargs) * sizeof(stack[0]));
if (stack == NULL) {
PyErr_NoMemory();
return -1;
}
kwnames = PyTuple_New(nkwargs);
if (kwnames == NULL) {
PyMem_Free(stack);
return -1;
}
/* Copy position arguments (borrowed references) */
memcpy(stack, args, nargs * sizeof(stack[0]));
kwstack = stack + nargs;
pos = i = 0;
/* This loop doesn't support lookup function mutating the dictionary
to change its size. It's a deliberate choice for speed, this function is
called in the performance critical hot code. */
while (PyDict_Next(kwargs, &pos, &key, &value)) {
Py_INCREF(key);
PyTuple_SET_ITEM(kwnames, i, key);
/* The stack contains borrowed references */
kwstack[i] = value;
i++;
}
*p_stack = stack;
*p_kwnames = kwnames;
return 0;
}
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