cpython/Objects/boolobject.c at main · https-github-com-nzysoft/cpython · GitHub

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/* Boolean type, a subtype of int */

#include "Python.h"

#include "pycore_long.h" // FALSE_TAG TRUE_TAG

#include "pycore_modsupport.h" // _PyArg_NoKwnames()

#include "pycore_object.h" // _Py_FatalRefcountError()

#include "pycore_runtime.h" // _Py_ID()

#include <stddef.h>

/* We define bool_repr to return "False" or "True" */

static PyObject *

bool_repr(PyObject *self)

{

return self == Py_True ? &_Py_ID(True) : &_Py_ID(False);

}

/* Function to return a bool from a C long */

PyObject *PyBool_FromLong(long ok)

{

return ok ? Py_True : Py_False;

}

/* We define bool_new to always return either Py_True or Py_False */

static PyObject *

bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds)

{

PyObject *x = Py_False;

long ok;

if (!_PyArg_NoKeywords("bool", kwds))

return NULL;

if (!PyArg_UnpackTuple(args, "bool", 0, 1, &x))

return NULL;

ok = PyObject_IsTrue(x);

if (ok < 0)

return NULL;

return PyBool_FromLong(ok);

}

static PyObject *

bool_vectorcall(PyObject *type, PyObject * const*args,

size_t nargsf, PyObject *kwnames)

{

long ok = 0;

if (!_PyArg_NoKwnames("bool", kwnames)) {

return NULL;

}

Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);

if (!_PyArg_CheckPositional("bool", nargs, 0, 1)) {

return NULL;

}

assert(PyType_Check(type));

if (nargs) {

ok = PyObject_IsTrue(args[0]);

if (ok < 0) {

return NULL;

}

return PyBool_FromLong(ok);

}

/* Arithmetic operations redefined to return bool if both args are bool. */

static PyObject *

bool_invert(PyObject *v)

{

if (PyErr_WarnEx(PyExc_DeprecationWarning,

"Bitwise inversion '~' on bool is deprecated. This "

"returns the bitwise inversion of the underlying int "

"object and is usually not what you expect from negating "

"a bool. Use the 'not' operator for boolean negation or "

"~int(x) if you really want the bitwise inversion of the "

"underlying int.",

1) < 0) {

return NULL;

}

return PyLong_Type.tp_as_number->nb_invert(v);

}

static PyObject *

bool_and(PyObject *a, PyObject *b)

{

if (!PyBool_Check(a) || !PyBool_Check(b))

return PyLong_Type.tp_as_number->nb_and(a, b);

return PyBool_FromLong((a == Py_True) & (b == Py_True));

}

static PyObject *

bool_or(PyObject *a, PyObject *b)

{

if (!PyBool_Check(a) || !PyBool_Check(b))

return PyLong_Type.tp_as_number->nb_or(a, b);

return PyBool_FromLong((a == Py_True) | (b == Py_True));

}

static PyObject *

bool_xor(PyObject *a, PyObject *b)

{

if (!PyBool_Check(a) || !PyBool_Check(b))

return PyLong_Type.tp_as_number->nb_xor(a, b);

return PyBool_FromLong((a == Py_True) ^ (b == Py_True));

}

/* Doc string */

PyDoc_STRVAR(bool_doc,

"bool(x) -> bool\n\

\n\

Returns True when the argument x is true, False otherwise.\n\

The builtins True and False are the only two instances of the class bool.\n\

The class bool is a subclass of the class int, and cannot be subclassed.");

/* Arithmetic methods -- only so we can override &, |, ^. */

static PyNumberMethods bool_as_number = {

0, /* nb_add */

0, /* nb_subtract */

0, /* nb_multiply */

0, /* nb_remainder */

0, /* nb_divmod */

0, /* nb_power */

0, /* nb_negative */

0, /* nb_positive */

0, /* nb_absolute */

0, /* nb_bool */

(unaryfunc)bool_invert, /* nb_invert */

0, /* nb_lshift */

0, /* nb_rshift */

bool_and, /* nb_and */

bool_xor, /* nb_xor */

bool_or, /* nb_or */

0, /* nb_int */

0, /* nb_reserved */

0, /* nb_float */

0, /* nb_inplace_add */

0, /* nb_inplace_subtract */

0, /* nb_inplace_multiply */

0, /* nb_inplace_remainder */

0, /* nb_inplace_power */

0, /* nb_inplace_lshift */

0, /* nb_inplace_rshift */

0, /* nb_inplace_and */

0, /* nb_inplace_xor */

0, /* nb_inplace_or */

0, /* nb_floor_divide */

0, /* nb_true_divide */

0, /* nb_inplace_floor_divide */

0, /* nb_inplace_true_divide */

0, /* nb_index */

};

static void

bool_dealloc(PyObject *boolean)

{

/* This should never get called, but we also don't want to SEGV if

* we accidentally decref Booleans out of existence. Instead,

* since bools are immortal, re-set the reference count.

_Py_SetImmortal(boolean);

}

/* The type object for bool. Note that this cannot be subclassed! */

PyTypeObject PyBool_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"bool",

offsetof(struct _longobject, long_value.ob_digit), /* tp_basicsize */

sizeof(digit), /* tp_itemsize */

bool_dealloc, /* tp_dealloc */

0, /* tp_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

bool_repr, /* tp_repr */

&bool_as_number, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

0, /* tp_call */

0, /* tp_str */

0, /* tp_getattro */

0, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT, /* tp_flags */

bool_doc, /* tp_doc */

0, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

0, /* tp_methods */

0, /* tp_members */

0, /* tp_getset */

&PyLong_Type, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

0, /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

bool_new, /* tp_new */

.tp_vectorcall = bool_vectorcall,

};

/* The objects representing bool values False and True */

struct _longobject _Py_FalseStruct = {

PyObject_HEAD_INIT(&PyBool_Type)

{ .lv_tag = _PyLong_FALSE_TAG,

{ 0 }

}

};

struct _longobject _Py_TrueStruct = {

PyObject_HEAD_INIT(&PyBool_Type)

{ .lv_tag = _PyLong_TRUE_TAG,

{ 1 }

}

};

cpython/Objects/boolobject.c at main · https-github-com-nzysoft/cpython · GitHub

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