This repository was archived by the owner on Feb 13, 2025. It is now read-only.
forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 64
Expand file tree
/
Copy pathboolobject.c
More file actions
212 lines (185 loc) · 7.32 KB
/
boolobject.c
File metadata and controls
212 lines (185 loc) · 7.32 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
/* Boolean type, a subtype of int */
#include "Python.h"
#include "pycore_object.h" // _Py_FatalRefcountError()
#include "pycore_long.h" // FALSE_TAG TRUE_TAG
#include "pycore_runtime.h" // _Py_ID()
#include <stddef.h>
/* We define bool_repr to return "False" or "True" */
static PyObject *
bool_repr(PyObject *self)
{
PyObject *res = self == Py_True ? &_Py_ID(True) : &_Py_ID(False);
return Py_NewRef(res);
}
/* Function to return a bool from a C long */
PyObject *PyBool_FromLong(long ok)
{
PyObject *result;
if (ok)
result = Py_True;
else
result = Py_False;
return Py_NewRef(result);
}
/* 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_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 */
0, /* 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 _Py_NO_RETURN
bool_dealloc(PyObject* Py_UNUSED(ignore))
{
_Py_FatalRefcountError("deallocating True or False");
}
/* 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 }
}
};