multidict/multidict/_multilib/state.h at 6024eaa35d590c0df05fd4db93e874f6a0beb719 · aio-libs/multidict · GitHub

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
#ifndef _MULTIDICT_STATE_H
#define _MULTIDICT_STATE_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdatomic.h>

/* State of the _multidict module */
typedef struct {
    PyTypeObject *IStrType;

    PyTypeObject *MultiDictType;
    PyTypeObject *CIMultiDictType;
    PyTypeObject *MultiDictProxyType;
    PyTypeObject *CIMultiDictProxyType;

    PyTypeObject *KeysViewType;
    PyTypeObject *ItemsViewType;
    PyTypeObject *ValuesViewType;

    PyTypeObject *KeysIterType;
    PyTypeObject *ItemsIterType;
    PyTypeObject *ValuesIterType;

    PyObject *str_canonical;
    PyObject *str_lower;
    PyObject *str_name;

    _Atomic uint64_t global_version;
} mod_state;

static inline mod_state *
get_mod_state(PyObject *mod)
{
    mod_state *state = (mod_state *)PyModule_GetState(mod);
    assert(state != NULL);
    return state;
}

static inline mod_state *
get_mod_state_by_cls(PyTypeObject *cls)
{
    mod_state *state = (mod_state *)PyType_GetModuleState(cls);
    assert(state != NULL);
    return state;
}

#if PY_VERSION_HEX < 0x030b0000
PyObject *
PyType_GetModuleByDef(PyTypeObject *tp, PyModuleDef *def)
{
    PyModuleDef *mod_def;
    if (!PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
        goto err;
    }
    PyObject *mod = NULL;

    mod = PyType_GetModule(tp);
    if (mod == NULL) {
        PyErr_Clear();
    } else {
        mod_def = PyModule_GetDef(mod);
        if (mod_def == def) {
            return mod;
        }
    }

    PyObject *mro = tp->tp_mro;
    assert(mro != NULL);
    assert(PyTuple_Check(mro));
    assert(PyTuple_GET_SIZE(mro) >= 1);
    assert(PyTuple_GET_ITEM(mro, 0) == (PyObject *)tp);

    Py_ssize_t n = PyTuple_GET_SIZE(mro);
    for (Py_ssize_t i = 1; i < n; i++) {
        PyObject *super = PyTuple_GET_ITEM(mro, i);
        if (!PyType_HasFeature((PyTypeObject *)super, Py_TPFLAGS_HEAPTYPE)) {
            continue;
        }
        mod = PyType_GetModule((PyTypeObject *)super);
        if (mod == NULL) {
            PyErr_Clear();
        } else {
            mod_def = PyModule_GetDef(mod);
            if (mod_def == def) {
                return mod;
            }
        }
    }

err:
    PyErr_Format(
        PyExc_TypeError,
        "PyType_GetModuleByDef: No superclass of '%s' has the given module",
        tp->tp_name);
    return NULL;
}
#endif

static PyModuleDef multidict_module;

static inline int
get_mod_state_by_def_checked(PyObject *self, mod_state **ret)
{
    PyTypeObject *tp = Py_TYPE(self);
    PyObject *mod = PyType_GetModuleByDef(tp, &multidict_module);
    if (mod == NULL) {
        *ret = NULL;
        if (PyErr_ExceptionMatches(PyExc_TypeError)) {
            PyErr_Clear();
            return 0;
        }
        return -1;
    }
    *ret = get_mod_state(mod);
    return 1;
}

static inline mod_state *
get_mod_state_by_def(PyObject *self)
{
    PyTypeObject *tp = Py_TYPE(self);
    PyObject *mod = PyType_GetModuleByDef(tp, &multidict_module);
    assert(mod != NULL);
    return get_mod_state(mod);
}

static inline uint64_t
NEXT_VERSION(mod_state *state)
{
    return atomic_fetch_add_explicit(
               &state->global_version, 1, memory_order_relaxed) +
           1;
}

#ifdef __cplusplus
}
#endif
#endif