This file is indexed.

/usr/lib/python3/dist-packages/Cython/Shadow.py is in cython3 0.26.1-0.4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
# cython.* namespace for pure mode.
from __future__ import absolute_import

__version__ = "0.26.1"

try:
    from __builtin__ import basestring
except ImportError:
    basestring = str


# BEGIN shameless copy from Cython/minivect/minitypes.py

class _ArrayType(object):

    is_array = True
    subtypes = ['dtype']

    def __init__(self, dtype, ndim, is_c_contig=False, is_f_contig=False,
                 inner_contig=False, broadcasting=None):
        self.dtype = dtype
        self.ndim = ndim
        self.is_c_contig = is_c_contig
        self.is_f_contig = is_f_contig
        self.inner_contig = inner_contig or is_c_contig or is_f_contig
        self.broadcasting = broadcasting

    def __repr__(self):
        axes = [":"] * self.ndim
        if self.is_c_contig:
            axes[-1] = "::1"
        elif self.is_f_contig:
            axes[0] = "::1"

        return "%s[%s]" % (self.dtype, ", ".join(axes))


def index_type(base_type, item):
    """
    Support array type creation by slicing, e.g. double[:, :] specifies
    a 2D strided array of doubles. The syntax is the same as for
    Cython memoryviews.
    """
    class InvalidTypeSpecification(Exception):
        pass

    def verify_slice(s):
        if s.start or s.stop or s.step not in (None, 1):
            raise InvalidTypeSpecification(
                "Only a step of 1 may be provided to indicate C or "
                "Fortran contiguity")

    if isinstance(item, tuple):
        step_idx = None
        for idx, s in enumerate(item):
            verify_slice(s)
            if s.step and (step_idx or idx not in (0, len(item) - 1)):
                raise InvalidTypeSpecification(
                    "Step may only be provided once, and only in the "
                    "first or last dimension.")

            if s.step == 1:
                step_idx = idx

        return _ArrayType(base_type, len(item),
                          is_c_contig=step_idx == len(item) - 1,
                          is_f_contig=step_idx == 0)
    elif isinstance(item, slice):
        verify_slice(item)
        return _ArrayType(base_type, 1, is_c_contig=bool(item.step))
    else:
        # int[8] etc.
        assert int(item) == item  # array size must be a plain integer
        array(base_type, item)

# END shameless copy


compiled = False

_Unspecified = object()

# Function decorators

def _empty_decorator(x):
    return x

def locals(**arg_types):
    return _empty_decorator

def test_assert_path_exists(*paths):
    return _empty_decorator

def test_fail_if_path_exists(*paths):
    return _empty_decorator

class _EmptyDecoratorAndManager(object):
    def __call__(self, x):
        return x
    def __enter__(self):
        pass
    def __exit__(self, exc_type, exc_value, traceback):
        pass

class _Optimization(object):
    pass

cclass = ccall = cfunc = _EmptyDecoratorAndManager()

returns = wraparound = boundscheck = initializedcheck = nonecheck = \
    overflowcheck = embedsignature = cdivision = cdivision_warnings = \
    always_allows_keywords = profile = linetrace = infer_type = \
    unraisable_tracebacks = freelist = \
        lambda arg: _EmptyDecoratorAndManager()

optimization = _Optimization()

overflowcheck.fold = optimization.use_switch = \
    optimization.unpack_method_calls = lambda arg: _EmptyDecoratorAndManager()

final = internal = type_version_tag = no_gc_clear = no_gc = _empty_decorator


_cython_inline = None
def inline(f, *args, **kwds):
    if isinstance(f, basestring):
        global _cython_inline
        if _cython_inline is None:
            from Cython.Build.Inline import cython_inline as _cython_inline
        return _cython_inline(f, *args, **kwds)
    else:
        assert len(args) == len(kwds) == 0
        return f


def compile(f):
    from Cython.Build.Inline import RuntimeCompiledFunction
    return RuntimeCompiledFunction(f)


# Special functions

def cdiv(a, b):
    q = a / b
    if q < 0:
        q += 1
    return q

def cmod(a, b):
    r = a % b
    if (a*b) < 0:
        r -= b
    return r


# Emulated language constructs

def cast(type, *args, **kwargs):
    kwargs.pop('typecheck', None)
    assert not kwargs
    if hasattr(type, '__call__'):
        return type(*args)
    else:
        return args[0]

def sizeof(arg):
    return 1

def typeof(arg):
    return arg.__class__.__name__
    # return type(arg)

def address(arg):
    return pointer(type(arg))([arg])

def declare(type=None, value=_Unspecified, **kwds):
    if type not in (None, object) and hasattr(type, '__call__'):
        if value is not _Unspecified:
            return type(value)
        else:
            return type()
    else:
        return value

class _nogil(object):
    """Support for 'with nogil' statement
    """
    def __enter__(self):
        pass
    def __exit__(self, exc_class, exc, tb):
        return exc_class is None

nogil = _nogil()
gil = _nogil()
del _nogil

# Emulated types

class CythonMetaType(type):

    def __getitem__(type, ix):
        return array(type, ix)

CythonTypeObject = CythonMetaType('CythonTypeObject', (object,), {})

class CythonType(CythonTypeObject):

    def _pointer(self, n=1):
        for i in range(n):
            self = pointer(self)
        return self

class PointerType(CythonType):

    def __init__(self, value=None):
        if isinstance(value, (ArrayType, PointerType)):
            self._items = [cast(self._basetype, a) for a in value._items]
        elif isinstance(value, list):
            self._items = [cast(self._basetype, a) for a in value]
        elif value is None or value == 0:
            self._items = []
        else:
            raise ValueError

    def __getitem__(self, ix):
        if ix < 0:
            raise IndexError("negative indexing not allowed in C")
        return self._items[ix]

    def __setitem__(self, ix, value):
        if ix < 0:
            raise IndexError("negative indexing not allowed in C")
        self._items[ix] = cast(self._basetype, value)

    def __eq__(self, value):
        if value is None and not self._items:
            return True
        elif type(self) != type(value):
            return False
        else:
            return not self._items and not value._items

    def __repr__(self):
        return "%s *" % (self._basetype,)

class ArrayType(PointerType):

    def __init__(self):
        self._items = [None] * self._n


class StructType(CythonType):

    def __init__(self, cast_from=_Unspecified, **data):
        if cast_from is not _Unspecified:
            # do cast
            if len(data) > 0:
                raise ValueError('Cannot accept keyword arguments when casting.')
            if type(cast_from) is not type(self):
                raise ValueError('Cannot cast from %s'%cast_from)
            for key, value in cast_from.__dict__.items():
                setattr(self, key, value)
        else:
            for key, value in data.items():
                setattr(self, key, value)

    def __setattr__(self, key, value):
        if key in self._members:
            self.__dict__[key] = cast(self._members[key], value)
        else:
            raise AttributeError("Struct has no member '%s'" % key)


class UnionType(CythonType):

    def __init__(self, cast_from=_Unspecified, **data):
        if cast_from is not _Unspecified:
            # do type cast
            if len(data) > 0:
                raise ValueError('Cannot accept keyword arguments when casting.')
            if isinstance(cast_from, dict):
                datadict = cast_from
            elif type(cast_from) is type(self):
                datadict = cast_from.__dict__
            else:
                raise ValueError('Cannot cast from %s'%cast_from)
        else:
            datadict = data
        if len(datadict) > 1:
            raise AttributeError("Union can only store one field at a time.")
        for key, value in datadict.items():
            setattr(self, key, value)

    def __setattr__(self, key, value):
        if key in '__dict__':
            CythonType.__setattr__(self, key, value)
        elif key in self._members:
            self.__dict__ = {key: cast(self._members[key], value)}
        else:
            raise AttributeError("Union has no member '%s'" % key)

def pointer(basetype):
    class PointerInstance(PointerType):
        _basetype = basetype
    return PointerInstance

def array(basetype, n):
    class ArrayInstance(ArrayType):
        _basetype = basetype
        _n = n
    return ArrayInstance

def struct(**members):
    class StructInstance(StructType):
        _members = members
    for key in members:
        setattr(StructInstance, key, None)
    return StructInstance

def union(**members):
    class UnionInstance(UnionType):
        _members = members
    for key in members:
        setattr(UnionInstance, key, None)
    return UnionInstance

class typedef(CythonType):

    def __init__(self, type, name=None):
        self._basetype = type
        self.name = name

    def __call__(self, *arg):
        value = cast(self._basetype, *arg)
        return value

    def __repr__(self):
        return self.name or str(self._basetype)

    __getitem__ = index_type

class _FusedType(CythonType):
    pass


def fused_type(*args):
    if not args:
        raise TypeError("Expected at least one type as argument")

    # Find the numeric type with biggest rank if all types are numeric
    rank = -1
    for type in args:
        if type not in (py_int, py_long, py_float, py_complex):
            break

        if type_ordering.index(type) > rank:
            result_type = type
    else:
        return result_type

    # Not a simple numeric type, return a fused type instance. The result
    # isn't really meant to be used, as we can't keep track of the context in
    # pure-mode. Casting won't do anything in this case.
    return _FusedType()


def _specialized_from_args(signatures, args, kwargs):
    "Perhaps this should be implemented in a TreeFragment in Cython code"
    raise Exception("yet to be implemented")


py_int = typedef(int, "int")
try:
    py_long = typedef(long, "long")
except NameError:  # Py3
    py_long = typedef(int, "long")
py_float = typedef(float, "float")
py_complex = typedef(complex, "double complex")


# Predefined types

int_types = ['char', 'short', 'Py_UNICODE', 'int', 'Py_UCS4', 'long', 'longlong', 'Py_ssize_t', 'size_t']
float_types = ['longdouble', 'double', 'float']
complex_types = ['longdoublecomplex', 'doublecomplex', 'floatcomplex', 'complex']
other_types = ['bint', 'void']

to_repr = {
    'longlong': 'long long',
    'longdouble': 'long double',
    'longdoublecomplex': 'long double complex',
    'doublecomplex': 'double complex',
    'floatcomplex': 'float complex',
}.get

gs = globals()

# note: cannot simply name the unicode type here as 2to3 gets in the way and replaces it by str
try:
    import __builtin__ as builtins
except ImportError:  # Py3
    import builtins

gs['unicode'] = typedef(getattr(builtins, 'unicode', str), 'unicode')
del builtins

for name in int_types:
    reprname = to_repr(name, name)
    gs[name] = typedef(py_int, reprname)
    if name not in ('Py_UNICODE', 'Py_UCS4') and not name.endswith('size_t'):
        gs['u'+name] = typedef(py_int, "unsigned " + reprname)
        gs['s'+name] = typedef(py_int, "signed " + reprname)

for name in float_types:
    gs[name] = typedef(py_float, to_repr(name, name))

for name in complex_types:
    gs[name] = typedef(py_complex, to_repr(name, name))

bint = typedef(bool, "bint")
void = typedef(int, "void")

for t in int_types + float_types + complex_types + other_types:
    for i in range(1, 4):
        gs["%s_%s" % ('p'*i, t)] = globals()[t]._pointer(i)

void = typedef(None, "void")
NULL = p_void(0)

integral = floating = numeric = _FusedType()

type_ordering = [py_int, py_long, py_float, py_complex]

class CythonDotParallel(object):
    """
    The cython.parallel module.
    """

    __all__ = ['parallel', 'prange', 'threadid']

    def parallel(self, num_threads=None):
        return nogil

    def prange(self, start=0, stop=None, step=1, schedule=None, nogil=False):
        if stop is None:
            stop = start
            start = 0
        return range(start, stop, step)

    def threadid(self):
        return 0

    # def threadsavailable(self):
        # return 1

import sys
sys.modules['cython.parallel'] = CythonDotParallel()
del sys