summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_compile.py
blob: 611667690fe3e2efe65e4141a2be2790dd6926c3 (plain)
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
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
import math
import unittest
import sys
import _ast
import types
from test import support

class TestSpecifics(unittest.TestCase):

    def compile_single(self, source):
        compile(source, "<single>", "single")

    def assertInvalidSingle(self, source):
        self.assertRaises(SyntaxError, self.compile_single, source)

    def test_no_ending_newline(self):
        compile("hi", "<test>", "exec")
        compile("hi\r", "<test>", "exec")

    def test_empty(self):
        compile("", "<test>", "exec")

    def test_other_newlines(self):
        compile("\r\n", "<test>", "exec")
        compile("\r", "<test>", "exec")
        compile("hi\r\nstuff\r\ndef f():\n    pass\r", "<test>", "exec")
        compile("this_is\rreally_old_mac\rdef f():\n    pass", "<test>", "exec")

    def test_debug_assignment(self):
        # catch assignments to __debug__
        self.assertRaises(SyntaxError, compile, '__debug__ = 1', '?', 'single')
        import builtins
        prev = builtins.__debug__
        setattr(builtins, '__debug__', 'sure')
        setattr(builtins, '__debug__', prev)

    def test_argument_handling(self):
        # detect duplicate positional and keyword arguments
        self.assertRaises(SyntaxError, eval, 'lambda a,a:0')
        self.assertRaises(SyntaxError, eval, 'lambda a,a=1:0')
        self.assertRaises(SyntaxError, eval, 'lambda a=1,a=1:0')
        self.assertRaises(SyntaxError, exec, 'def f(a, a): pass')
        self.assertRaises(SyntaxError, exec, 'def f(a = 0, a = 1): pass')
        self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')

    def test_syntax_error(self):
        self.assertRaises(SyntaxError, compile, "1+*3", "filename", "exec")

    def test_none_keyword_arg(self):
        self.assertRaises(SyntaxError, compile, "f(None=1)", "<string>", "exec")

    def test_duplicate_global_local(self):
        self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')

    def test_exec_with_general_mapping_for_locals(self):

        class M:
            "Test mapping interface versus possible calls from eval()."
            def __getitem__(self, key):
                if key == 'a':
                    return 12
                raise KeyError
            def __setitem__(self, key, value):
                self.results = (key, value)
            def keys(self):
                return list('xyz')

        m = M()
        g = globals()
        exec('z = a', g, m)
        self.assertEqual(m.results, ('z', 12))
        try:
            exec('z = b', g, m)
        except NameError:
            pass
        else:
            self.fail('Did not detect a KeyError')
        exec('z = dir()', g, m)
        self.assertEqual(m.results, ('z', list('xyz')))
        exec('z = globals()', g, m)
        self.assertEqual(m.results, ('z', g))
        exec('z = locals()', g, m)
        self.assertEqual(m.results, ('z', m))
        self.assertRaises(TypeError, exec, 'z = b', m)

        class A:
            "Non-mapping"
            pass
        m = A()
        self.assertRaises(TypeError, exec, 'z = a', g, m)

        # Verify that dict subclasses work as well
        class D(dict):
            def __getitem__(self, key):
                if key == 'a':
                    return 12
                return dict.__getitem__(self, key)
        d = D()
        exec('z = a', g, d)
        self.assertEqual(d['z'], 12)

    def test_extended_arg(self):
        longexpr = 'x = x or ' + '-x' * 2500
        g = {}
        code = '''
def f(x):
    %s
    %s
    %s
    %s
    %s
    %s
    %s
    %s
    %s
    %s
    # the expressions above have no effect, x == argument
    while x:
        x -= 1
        # EXTENDED_ARG/JUMP_ABSOLUTE here
    return x
''' % ((longexpr,)*10)
        exec(code, g)
        self.assertEqual(g['f'](5), 0)

    def test_argument_order(self):
        self.assertRaises(SyntaxError, exec, 'def f(a=1, b): pass')

    def test_float_literals(self):
        # testing bad float literals
        self.assertRaises(SyntaxError, eval, "2e")
        self.assertRaises(SyntaxError, eval, "2.0e+")
        self.assertRaises(SyntaxError, eval, "1e-")
        self.assertRaises(SyntaxError, eval, "3-4e/21")

    def test_indentation(self):
        # testing compile() of indented block w/o trailing newline"
        s = """
if 1:
    if 2:
        pass"""
        compile(s, "<string>", "exec")

    # This test is probably specific to CPython and may not generalize
    # to other implementations.  We are trying to ensure that when
    # the first line of code starts after 256, correct line numbers
    # in tracebacks are still produced.
    def test_leading_newlines(self):
        s256 = "".join(["\n"] * 256 + ["spam"])
        co = compile(s256, 'fn', 'exec')
        self.assertEqual(co.co_firstlineno, 257)
        self.assertEqual(co.co_lnotab, bytes())

    def test_literals_with_leading_zeroes(self):
        for arg in ["077787", "0xj", "0x.", "0e",  "090000000000000",
                    "080000000000000", "000000000000009", "000000000000008",
                    "0b42", "0BADCAFE", "0o123456789", "0b1.1", "0o4.2",
                    "0b101j2", "0o153j2", "0b100e1", "0o777e1", "0777",
                    "000777", "000000000000007"]:
            self.assertRaises(SyntaxError, eval, arg)

        self.assertEqual(eval("0xff"), 255)
        self.assertEqual(eval("0777."), 777)
        self.assertEqual(eval("0777.0"), 777)
        self.assertEqual(eval("000000000000000000000000000000000000000000000000000777e0"), 777)
        self.assertEqual(eval("0777e1"), 7770)
        self.assertEqual(eval("0e0"), 0)
        self.assertEqual(eval("0000e-012"), 0)
        self.assertEqual(eval("09.5"), 9.5)
        self.assertEqual(eval("0777j"), 777j)
        self.assertEqual(eval("000"), 0)
        self.assertEqual(eval("00j"), 0j)
        self.assertEqual(eval("00.0"), 0)
        self.assertEqual(eval("0e3"), 0)
        self.assertEqual(eval("090000000000000."), 90000000000000.)
        self.assertEqual(eval("090000000000000.0000000000000000000000"), 90000000000000.)
        self.assertEqual(eval("090000000000000e0"), 90000000000000.)
        self.assertEqual(eval("090000000000000e-0"), 90000000000000.)
        self.assertEqual(eval("090000000000000j"), 90000000000000j)
        self.assertEqual(eval("000000000000008."), 8.)
        self.assertEqual(eval("000000000000009."), 9.)
        self.assertEqual(eval("0b101010"), 42)
        self.assertEqual(eval("-0b000000000010"), -2)
        self.assertEqual(eval("0o777"), 511)
        self.assertEqual(eval("-0o0000010"), -8)

    def test_unary_minus(self):
        # Verify treatment of unary minus on negative numbers SF bug #660455
        if sys.maxsize == 2147483647:
            # 32-bit machine
            all_one_bits = '0xffffffff'
            self.assertEqual(eval(all_one_bits), 4294967295)
            self.assertEqual(eval("-" + all_one_bits), -4294967295)
        elif sys.maxsize == 9223372036854775807:
            # 64-bit machine
            all_one_bits = '0xffffffffffffffff'
            self.assertEqual(eval(all_one_bits), 18446744073709551615)
            self.assertEqual(eval("-" + all_one_bits), -18446744073709551615)
        else:
            self.fail("How many bits *does* this machine have???")
        # Verify treatment of constant folding on -(sys.maxsize+1)
        # i.e. -2147483648 on 32 bit platforms.  Should return int.
        self.assertIsInstance(eval("%s" % (-sys.maxsize - 1)), int)
        self.assertIsInstance(eval("%s" % (-sys.maxsize - 2)), int)

    if sys.maxsize == 9223372036854775807:
        def test_32_63_bit_values(self):
            a = +4294967296  # 1 << 32
            b = -4294967296  # 1 << 32
            c = +281474976710656  # 1 << 48
            d = -281474976710656  # 1 << 48
            e = +4611686018427387904  # 1 << 62
            f = -4611686018427387904  # 1 << 62
            g = +9223372036854775807  # 1 << 63 - 1
            h = -9223372036854775807  # 1 << 63 - 1

            for variable in self.test_32_63_bit_values.__code__.co_consts:
                if variable is not None:
                    self.assertIsInstance(variable, int)

    def test_sequence_unpacking_error(self):
        # Verify sequence packing/unpacking with "or".  SF bug #757818
        i,j = (1, -1) or (-1, 1)
        self.assertEqual(i, 1)
        self.assertEqual(j, -1)

    def test_none_assignment(self):
        stmts = [
            'None = 0',
            'None += 0',
            '__builtins__.None = 0',
            'def None(): pass',
            'class None: pass',
            '(a, None) = 0, 0',
            'for None in range(10): pass',
            'def f(None): pass',
            'import None',
            'import x as None',
            'from x import None',
            'from x import y as None'
        ]
        for stmt in stmts:
            stmt += "\n"
            self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'single')
            self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')

    def test_import(self):
        succeed = [
            'import sys',
            'import os, sys',
            'import os as bar',
            'import os.path as bar',
            'from __future__ import nested_scopes, generators',
            'from __future__ import (nested_scopes,\ngenerators)',
            'from __future__ import (nested_scopes,\ngenerators,)',
            'from sys import stdin, stderr, stdout',
            'from sys import (stdin, stderr,\nstdout)',
            'from sys import (stdin, stderr,\nstdout,)',
            'from sys import (stdin\n, stderr, stdout)',
            'from sys import (stdin\n, stderr, stdout,)',
            'from sys import stdin as si, stdout as so, stderr as se',
            'from sys import (stdin as si, stdout as so, stderr as se)',
            'from sys import (stdin as si, stdout as so, stderr as se,)',
            ]
        fail = [
            'import (os, sys)',
            'import (os), (sys)',
            'import ((os), (sys))',
            'import (sys',
            'import sys)',
            'import (os,)',
            'import os As bar',
            'import os.path a bar',
            'from sys import stdin As stdout',
            'from sys import stdin a stdout',
            'from (sys) import stdin',
            'from __future__ import (nested_scopes',
            'from __future__ import nested_scopes)',
            'from __future__ import nested_scopes,\ngenerators',
            'from sys import (stdin',
            'from sys import stdin)',
            'from sys import stdin, stdout,\nstderr',
            'from sys import stdin si',
            'from sys import stdin,'
            'from sys import (*)',
            'from sys import (stdin,, stdout, stderr)',
            'from sys import (stdin, stdout),',
            ]
        for stmt in succeed:
            compile(stmt, 'tmp', 'exec')
        for stmt in fail:
            self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')

    def test_for_distinct_code_objects(self):
        # SF bug 1048870
        def f():
            f1 = lambda x=1: x
            f2 = lambda x=2: x
            return f1, f2
        f1, f2 = f()
        self.assertNotEqual(id(f1.__code__), id(f2.__code__))

    def test_lambda_doc(self):
        l = lambda: "foo"
        self.assertIsNone(l.__doc__)

    def test_encoding(self):
        code = b'# -*- coding: badencoding -*-\npass\n'
        self.assertRaises(SyntaxError, compile, code, 'tmp', 'exec')
        code = '# -*- coding: badencoding -*-\n"\xc2\xa4"\n'
        compile(code, 'tmp', 'exec')
        self.assertEqual(eval(code), '\xc2\xa4')
        code = '"\xc2\xa4"\n'
        self.assertEqual(eval(code), '\xc2\xa4')
        code = b'"\xc2\xa4"\n'
        self.assertEqual(eval(code), '\xa4')
        code = b'# -*- coding: latin1 -*-\n"\xc2\xa4"\n'
        self.assertEqual(eval(code), '\xc2\xa4')
        code = b'# -*- coding: utf-8 -*-\n"\xc2\xa4"\n'
        self.assertEqual(eval(code), '\xa4')
        code = b'# -*- coding: iso8859-15 -*-\n"\xc2\xa4"\n'
        self.assertEqual(eval(code), '\xc2\u20ac')
        code = '"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
        self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xc2\xa4')
        code = b'"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
        self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xa4')

    def test_subscripts(self):
        # SF bug 1448804
        # Class to make testing subscript results easy
        class str_map(object):
            def __init__(self):
                self.data = {}
            def __getitem__(self, key):
                return self.data[str(key)]
            def __setitem__(self, key, value):
                self.data[str(key)] = value
            def __delitem__(self, key):
                del self.data[str(key)]
            def __contains__(self, key):
                return str(key) in self.data
        d = str_map()
        # Index
        d[1] = 1
        self.assertEqual(d[1], 1)
        d[1] += 1
        self.assertEqual(d[1], 2)
        del d[1]
        self.assertNotIn(1, d)
        # Tuple of indices
        d[1, 1] = 1
        self.assertEqual(d[1, 1], 1)
        d[1, 1] += 1
        self.assertEqual(d[1, 1], 2)
        del d[1, 1]
        self.assertNotIn((1, 1), d)
        # Simple slice
        d[1:2] = 1
        self.assertEqual(d[1:2], 1)
        d[1:2] += 1
        self.assertEqual(d[1:2], 2)
        del d[1:2]
        self.assertNotIn(slice(1, 2), d)
        # Tuple of simple slices
        d[1:2, 1:2] = 1
        self.assertEqual(d[1:2, 1:2], 1)
        d[1:2, 1:2] += 1
        self.assertEqual(d[1:2, 1:2], 2)
        del d[1:2, 1:2]
        self.assertNotIn((slice(1, 2), slice(1, 2)), d)
        # Extended slice
        d[1:2:3] = 1
        self.assertEqual(d[1:2:3], 1)
        d[1:2:3] += 1
        self.assertEqual(d[1:2:3], 2)
        del d[1:2:3]
        self.assertNotIn(slice(1, 2, 3), d)
        # Tuple of extended slices
        d[1:2:3, 1:2:3] = 1
        self.assertEqual(d[1:2:3, 1:2:3], 1)
        d[1:2:3, 1:2:3] += 1
        self.assertEqual(d[1:2:3, 1:2:3], 2)
        del d[1:2:3, 1:2:3]
        self.assertNotIn((slice(1, 2, 3), slice(1, 2, 3)), d)
        # Ellipsis
        d[...] = 1
        self.assertEqual(d[...], 1)
        d[...] += 1
        self.assertEqual(d[...], 2)
        del d[...]
        self.assertNotIn(Ellipsis, d)
        # Tuple of Ellipses
        d[..., ...] = 1
        self.assertEqual(d[..., ...], 1)
        d[..., ...] += 1
        self.assertEqual(d[..., ...], 2)
        del d[..., ...]
        self.assertNotIn((Ellipsis, Ellipsis), d)

    def test_annotation_limit(self):
        # 16 bits are available for # of annotations, but only 8 bits are
        # available for the parameter count, hence 255
        # is the max. Ensure the result of too many annotations is a
        # SyntaxError.
        s = "def f(%s): pass"
        s %= ', '.join('a%d:%d' % (i,i) for i in range(256))
        self.assertRaises(SyntaxError, compile, s, '?', 'exec')
        # Test that the max # of annotations compiles.
        s = "def f(%s): pass"
        s %= ', '.join('a%d:%d' % (i,i) for i in range(255))
        compile(s, '?', 'exec')

    def test_mangling(self):
        class A:
            def f():
                __mangled = 1
                __not_mangled__ = 2
                import __mangled_mod
                import __package__.module

        self.assertIn("_A__mangled", A.f.__code__.co_varnames)
        self.assertIn("__not_mangled__", A.f.__code__.co_varnames)
        self.assertIn("_A__mangled_mod", A.f.__code__.co_varnames)
        self.assertIn("__package__", A.f.__code__.co_varnames)

    def test_compile_ast(self):
        fname = __file__
        if fname.lower().endswith(('pyc', 'pyo')):
            fname = fname[:-1]
        with open(fname, 'r') as f:
            fcontents = f.read()
        sample_code = [
            ['<assign>', 'x = 5'],
            ['<ifblock>', """if True:\n    pass\n"""],
            ['<forblock>', """for n in [1, 2, 3]:\n    print(n)\n"""],
            ['<deffunc>', """def foo():\n    pass\nfoo()\n"""],
            [fname, fcontents],
        ]

        for fname, code in sample_code:
            co1 = compile(code, '%s1' % fname, 'exec')
            ast = compile(code, '%s2' % fname, 'exec', _ast.PyCF_ONLY_AST)
            self.assertTrue(type(ast) == _ast.Module)
            co2 = compile(ast, '%s3' % fname, 'exec')
            self.assertEqual(co1, co2)
            # the code object's filename comes from the second compilation step
            self.assertEqual(co2.co_filename, '%s3' % fname)

        # raise exception when node type doesn't match with compile mode
        co1 = compile('print(1)', '<string>', 'exec', _ast.PyCF_ONLY_AST)
        self.assertRaises(TypeError, compile, co1, '<ast>', 'eval')

        # raise exception when node type is no start node
        self.assertRaises(TypeError, compile, _ast.If(), '<ast>', 'exec')

        # raise exception when node has invalid children
        ast = _ast.Module()
        ast.body = [_ast.BoolOp()]
        self.assertRaises(TypeError, compile, ast, '<ast>', 'exec')

    @support.cpython_only
    def test_same_filename_used(self):
        s = """def f(): pass\ndef g(): pass"""
        c = compile(s, "myfile", "exec")
        for obj in c.co_consts:
            if isinstance(obj, types.CodeType):
                self.assertIs(obj.co_filename, c.co_filename)

    def test_single_statement(self):
        self.compile_single("1 + 2")
        self.compile_single("\n1 + 2")
        self.compile_single("1 + 2\n")
        self.compile_single("1 + 2\n\n")
        self.compile_single("1 + 2\t\t\n")
        self.compile_single("1 + 2\t\t\n        ")
        self.compile_single("1 + 2 # one plus two")
        self.compile_single("1; 2")
        self.compile_single("import sys; sys")
        self.compile_single("def f():\n   pass")
        self.compile_single("while False:\n   pass")
        self.compile_single("if x:\n   f(x)")
        self.compile_single("if x:\n   f(x)\nelse:\n   g(x)")
        self.compile_single("class T:\n   pass")

    def test_bad_single_statement(self):
        self.assertInvalidSingle('1\n2')
        self.assertInvalidSingle('def f(): pass')
        self.assertInvalidSingle('a = 13\nb = 187')
        self.assertInvalidSingle('del x\ndel y')
        self.assertInvalidSingle('f()\ng()')
        self.assertInvalidSingle('f()\n# blah\nblah()')
        self.assertInvalidSingle('f()\nxy # blah\nblah()')
        self.assertInvalidSingle('x = 5 # comment\nx = 6\n')

    @support.cpython_only
    def test_compiler_recursion_limit(self):
        # Expected limit is sys.getrecursionlimit() * the scaling factor
        # in symtable.c (currently 3)
        # We expect to fail *at* that limit, because we use up some of
        # the stack depth limit in the test suite code
        # So we check the expected limit and 75% of that
        # XXX (ncoghlan): duplicating the scaling factor here is a little
        # ugly. Perhaps it should be exposed somewhere...
        fail_depth = sys.getrecursionlimit() * 3
        success_depth = int(fail_depth * 0.75)

        def check_limit(prefix, repeated):
            expect_ok = prefix + repeated * success_depth
            self.compile_single(expect_ok)
            broken = prefix + repeated * fail_depth
            details = "Compiling ({!r} + {!r} * {})".format(
                         prefix, repeated, fail_depth)
            with self.assertRaises(RuntimeError, msg=details):
                self.compile_single(broken)

        check_limit("a", "()")
        check_limit("a", ".b")
        check_limit("a", "[0]")
        check_limit("a", "*a")


class TestStackSize(unittest.TestCase):
    # These tests check that the computed stack size for a code object
    # stays within reasonable bounds (see issue #21523 for an example
    # dysfunction).
    N = 100

    def check_stack_size(self, code):
        # To assert that the alleged stack size is not O(N), we
        # check that it is smaller than log(N).
        if isinstance(code, str):
            code = compile(code, "<foo>", "single")
        max_size = math.ceil(math.log(len(code.co_code)))
        self.assertLessEqual(code.co_stacksize, max_size)

    def test_and(self):
        self.check_stack_size("x and " * self.N + "x")

    def test_or(self):
        self.check_stack_size("x or " * self.N + "x")

    def test_and_or(self):
        self.check_stack_size("x and x or " * self.N + "x")

    def test_chained_comparison(self):
        self.check_stack_size("x < " * self.N + "x")

    def test_if_else(self):
        self.check_stack_size("x if x else " * self.N + "x")

    def test_binop(self):
        self.check_stack_size("x + " * self.N + "x")

    def test_func_and(self):
        code = "def f(x):\n"
        code += "   x and x\n" * self.N
        self.check_stack_size(code)


if __name__ == "__main__":
    unittest.main()