1094 lines
37 KiB
Python
1094 lines
37 KiB
Python
import dis
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import math
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import os
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import unittest
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import sys
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import _ast
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import tempfile
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import types
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from test import support
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from test.support import script_helper, FakePath
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class TestSpecifics(unittest.TestCase):
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def compile_single(self, source):
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compile(source, "<single>", "single")
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def assertInvalidSingle(self, source):
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self.assertRaises(SyntaxError, self.compile_single, source)
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def test_no_ending_newline(self):
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compile("hi", "<test>", "exec")
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compile("hi\r", "<test>", "exec")
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def test_empty(self):
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compile("", "<test>", "exec")
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def test_other_newlines(self):
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compile("\r\n", "<test>", "exec")
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compile("\r", "<test>", "exec")
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compile("hi\r\nstuff\r\ndef f():\n pass\r", "<test>", "exec")
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compile("this_is\rreally_old_mac\rdef f():\n pass", "<test>", "exec")
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def test_debug_assignment(self):
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# catch assignments to __debug__
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self.assertRaises(SyntaxError, compile, '__debug__ = 1', '?', 'single')
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import builtins
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prev = builtins.__debug__
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setattr(builtins, '__debug__', 'sure')
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self.assertEqual(__debug__, prev)
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setattr(builtins, '__debug__', prev)
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def test_argument_handling(self):
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# detect duplicate positional and keyword arguments
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self.assertRaises(SyntaxError, eval, 'lambda a,a:0')
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self.assertRaises(SyntaxError, eval, 'lambda a,a=1:0')
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self.assertRaises(SyntaxError, eval, 'lambda a=1,a=1:0')
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self.assertRaises(SyntaxError, exec, 'def f(a, a): pass')
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self.assertRaises(SyntaxError, exec, 'def f(a = 0, a = 1): pass')
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self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')
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def test_syntax_error(self):
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self.assertRaises(SyntaxError, compile, "1+*3", "filename", "exec")
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def test_none_keyword_arg(self):
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self.assertRaises(SyntaxError, compile, "f(None=1)", "<string>", "exec")
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def test_duplicate_global_local(self):
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self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')
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def test_exec_with_general_mapping_for_locals(self):
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class M:
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"Test mapping interface versus possible calls from eval()."
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def __getitem__(self, key):
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if key == 'a':
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return 12
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raise KeyError
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def __setitem__(self, key, value):
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self.results = (key, value)
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def keys(self):
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return list('xyz')
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m = M()
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g = globals()
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exec('z = a', g, m)
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self.assertEqual(m.results, ('z', 12))
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try:
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exec('z = b', g, m)
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except NameError:
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pass
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else:
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self.fail('Did not detect a KeyError')
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exec('z = dir()', g, m)
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self.assertEqual(m.results, ('z', list('xyz')))
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exec('z = globals()', g, m)
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self.assertEqual(m.results, ('z', g))
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exec('z = locals()', g, m)
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self.assertEqual(m.results, ('z', m))
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self.assertRaises(TypeError, exec, 'z = b', m)
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class A:
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"Non-mapping"
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pass
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m = A()
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self.assertRaises(TypeError, exec, 'z = a', g, m)
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# Verify that dict subclasses work as well
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class D(dict):
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def __getitem__(self, key):
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if key == 'a':
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return 12
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return dict.__getitem__(self, key)
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d = D()
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exec('z = a', g, d)
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self.assertEqual(d['z'], 12)
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def test_extended_arg(self):
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longexpr = 'x = x or ' + '-x' * 2500
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g = {}
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code = '''
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def f(x):
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%s
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%s
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%s
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%s
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%s
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%s
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%s
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%s
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%s
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%s
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# the expressions above have no effect, x == argument
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while x:
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x -= 1
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# EXTENDED_ARG/JUMP_ABSOLUTE here
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return x
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''' % ((longexpr,)*10)
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exec(code, g)
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self.assertEqual(g['f'](5), 0)
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def test_argument_order(self):
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self.assertRaises(SyntaxError, exec, 'def f(a=1, b): pass')
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def test_float_literals(self):
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# testing bad float literals
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self.assertRaises(SyntaxError, eval, "2e")
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self.assertRaises(SyntaxError, eval, "2.0e+")
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self.assertRaises(SyntaxError, eval, "1e-")
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self.assertRaises(SyntaxError, eval, "3-4e/21")
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def test_indentation(self):
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# testing compile() of indented block w/o trailing newline"
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s = """
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if 1:
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if 2:
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pass"""
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compile(s, "<string>", "exec")
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# This test is probably specific to CPython and may not generalize
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# to other implementations. We are trying to ensure that when
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# the first line of code starts after 256, correct line numbers
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# in tracebacks are still produced.
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def test_leading_newlines(self):
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s256 = "".join(["\n"] * 256 + ["spam"])
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co = compile(s256, 'fn', 'exec')
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self.assertEqual(co.co_firstlineno, 257)
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self.assertEqual(co.co_lnotab, bytes())
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def test_literals_with_leading_zeroes(self):
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for arg in ["077787", "0xj", "0x.", "0e", "090000000000000",
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"080000000000000", "000000000000009", "000000000000008",
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"0b42", "0BADCAFE", "0o123456789", "0b1.1", "0o4.2",
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"0b101j2", "0o153j2", "0b100e1", "0o777e1", "0777",
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"000777", "000000000000007"]:
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self.assertRaises(SyntaxError, eval, arg)
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self.assertEqual(eval("0xff"), 255)
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self.assertEqual(eval("0777."), 777)
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self.assertEqual(eval("0777.0"), 777)
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self.assertEqual(eval("000000000000000000000000000000000000000000000000000777e0"), 777)
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self.assertEqual(eval("0777e1"), 7770)
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self.assertEqual(eval("0e0"), 0)
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self.assertEqual(eval("0000e-012"), 0)
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self.assertEqual(eval("09.5"), 9.5)
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self.assertEqual(eval("0777j"), 777j)
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self.assertEqual(eval("000"), 0)
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self.assertEqual(eval("00j"), 0j)
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self.assertEqual(eval("00.0"), 0)
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self.assertEqual(eval("0e3"), 0)
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self.assertEqual(eval("090000000000000."), 90000000000000.)
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self.assertEqual(eval("090000000000000.0000000000000000000000"), 90000000000000.)
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self.assertEqual(eval("090000000000000e0"), 90000000000000.)
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self.assertEqual(eval("090000000000000e-0"), 90000000000000.)
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self.assertEqual(eval("090000000000000j"), 90000000000000j)
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self.assertEqual(eval("000000000000008."), 8.)
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self.assertEqual(eval("000000000000009."), 9.)
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self.assertEqual(eval("0b101010"), 42)
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self.assertEqual(eval("-0b000000000010"), -2)
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self.assertEqual(eval("0o777"), 511)
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self.assertEqual(eval("-0o0000010"), -8)
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def test_unary_minus(self):
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# Verify treatment of unary minus on negative numbers SF bug #660455
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if sys.maxsize == 2147483647:
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# 32-bit machine
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all_one_bits = '0xffffffff'
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self.assertEqual(eval(all_one_bits), 4294967295)
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self.assertEqual(eval("-" + all_one_bits), -4294967295)
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elif sys.maxsize == 9223372036854775807:
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# 64-bit machine
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all_one_bits = '0xffffffffffffffff'
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self.assertEqual(eval(all_one_bits), 18446744073709551615)
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self.assertEqual(eval("-" + all_one_bits), -18446744073709551615)
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else:
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self.fail("How many bits *does* this machine have???")
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# Verify treatment of constant folding on -(sys.maxsize+1)
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# i.e. -2147483648 on 32 bit platforms. Should return int.
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self.assertIsInstance(eval("%s" % (-sys.maxsize - 1)), int)
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self.assertIsInstance(eval("%s" % (-sys.maxsize - 2)), int)
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if sys.maxsize == 9223372036854775807:
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def test_32_63_bit_values(self):
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a = +4294967296 # 1 << 32
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b = -4294967296 # 1 << 32
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c = +281474976710656 # 1 << 48
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d = -281474976710656 # 1 << 48
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e = +4611686018427387904 # 1 << 62
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f = -4611686018427387904 # 1 << 62
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g = +9223372036854775807 # 1 << 63 - 1
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h = -9223372036854775807 # 1 << 63 - 1
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for variable in self.test_32_63_bit_values.__code__.co_consts:
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if variable is not None:
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self.assertIsInstance(variable, int)
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def test_sequence_unpacking_error(self):
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# Verify sequence packing/unpacking with "or". SF bug #757818
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i,j = (1, -1) or (-1, 1)
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self.assertEqual(i, 1)
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self.assertEqual(j, -1)
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def test_none_assignment(self):
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stmts = [
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'None = 0',
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'None += 0',
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'__builtins__.None = 0',
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'def None(): pass',
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'class None: pass',
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'(a, None) = 0, 0',
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'for None in range(10): pass',
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'def f(None): pass',
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'import None',
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'import x as None',
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'from x import None',
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'from x import y as None'
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]
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for stmt in stmts:
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stmt += "\n"
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self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'single')
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self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')
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def test_import(self):
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succeed = [
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'import sys',
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'import os, sys',
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'import os as bar',
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'import os.path as bar',
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'from __future__ import nested_scopes, generators',
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'from __future__ import (nested_scopes,\ngenerators)',
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'from __future__ import (nested_scopes,\ngenerators,)',
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'from sys import stdin, stderr, stdout',
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'from sys import (stdin, stderr,\nstdout)',
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'from sys import (stdin, stderr,\nstdout,)',
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'from sys import (stdin\n, stderr, stdout)',
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'from sys import (stdin\n, stderr, stdout,)',
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'from sys import stdin as si, stdout as so, stderr as se',
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'from sys import (stdin as si, stdout as so, stderr as se)',
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'from sys import (stdin as si, stdout as so, stderr as se,)',
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]
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fail = [
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'import (os, sys)',
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'import (os), (sys)',
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'import ((os), (sys))',
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'import (sys',
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'import sys)',
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'import (os,)',
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'import os As bar',
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'import os.path a bar',
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'from sys import stdin As stdout',
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'from sys import stdin a stdout',
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'from (sys) import stdin',
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'from __future__ import (nested_scopes',
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'from __future__ import nested_scopes)',
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'from __future__ import nested_scopes,\ngenerators',
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'from sys import (stdin',
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'from sys import stdin)',
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'from sys import stdin, stdout,\nstderr',
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'from sys import stdin si',
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'from sys import stdin,',
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'from sys import (*)',
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'from sys import (stdin,, stdout, stderr)',
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'from sys import (stdin, stdout),',
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]
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for stmt in succeed:
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compile(stmt, 'tmp', 'exec')
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for stmt in fail:
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self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')
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def test_for_distinct_code_objects(self):
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# SF bug 1048870
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def f():
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f1 = lambda x=1: x
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f2 = lambda x=2: x
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return f1, f2
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f1, f2 = f()
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self.assertNotEqual(id(f1.__code__), id(f2.__code__))
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def test_lambda_doc(self):
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l = lambda: "foo"
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self.assertIsNone(l.__doc__)
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def test_encoding(self):
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code = b'# -*- coding: badencoding -*-\npass\n'
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self.assertRaises(SyntaxError, compile, code, 'tmp', 'exec')
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code = '# -*- coding: badencoding -*-\n"\xc2\xa4"\n'
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compile(code, 'tmp', 'exec')
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self.assertEqual(eval(code), '\xc2\xa4')
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code = '"\xc2\xa4"\n'
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self.assertEqual(eval(code), '\xc2\xa4')
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code = b'"\xc2\xa4"\n'
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self.assertEqual(eval(code), '\xa4')
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code = b'# -*- coding: latin1 -*-\n"\xc2\xa4"\n'
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self.assertEqual(eval(code), '\xc2\xa4')
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code = b'# -*- coding: utf-8 -*-\n"\xc2\xa4"\n'
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self.assertEqual(eval(code), '\xa4')
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code = b'# -*- coding: iso8859-15 -*-\n"\xc2\xa4"\n'
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self.assertEqual(eval(code), '\xc2\u20ac')
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code = '"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
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self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xc2\xa4')
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code = b'"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
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self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xa4')
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def test_subscripts(self):
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# SF bug 1448804
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# Class to make testing subscript results easy
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class str_map(object):
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def __init__(self):
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self.data = {}
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def __getitem__(self, key):
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return self.data[str(key)]
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def __setitem__(self, key, value):
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self.data[str(key)] = value
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def __delitem__(self, key):
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del self.data[str(key)]
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def __contains__(self, key):
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return str(key) in self.data
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d = str_map()
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# Index
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d[1] = 1
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self.assertEqual(d[1], 1)
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d[1] += 1
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self.assertEqual(d[1], 2)
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del d[1]
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self.assertNotIn(1, d)
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# Tuple of indices
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d[1, 1] = 1
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self.assertEqual(d[1, 1], 1)
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d[1, 1] += 1
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self.assertEqual(d[1, 1], 2)
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del d[1, 1]
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self.assertNotIn((1, 1), d)
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# Simple slice
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d[1:2] = 1
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self.assertEqual(d[1:2], 1)
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d[1:2] += 1
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self.assertEqual(d[1:2], 2)
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del d[1:2]
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self.assertNotIn(slice(1, 2), d)
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# Tuple of simple slices
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d[1:2, 1:2] = 1
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self.assertEqual(d[1:2, 1:2], 1)
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d[1:2, 1:2] += 1
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self.assertEqual(d[1:2, 1:2], 2)
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del d[1:2, 1:2]
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self.assertNotIn((slice(1, 2), slice(1, 2)), d)
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# Extended slice
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d[1:2:3] = 1
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self.assertEqual(d[1:2:3], 1)
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d[1:2:3] += 1
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self.assertEqual(d[1:2:3], 2)
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del d[1:2:3]
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self.assertNotIn(slice(1, 2, 3), d)
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# Tuple of extended slices
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d[1:2:3, 1:2:3] = 1
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self.assertEqual(d[1:2:3, 1:2:3], 1)
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d[1:2:3, 1:2:3] += 1
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self.assertEqual(d[1:2:3, 1:2:3], 2)
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del d[1:2:3, 1:2:3]
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self.assertNotIn((slice(1, 2, 3), slice(1, 2, 3)), d)
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# Ellipsis
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d[...] = 1
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self.assertEqual(d[...], 1)
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d[...] += 1
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self.assertEqual(d[...], 2)
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del d[...]
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self.assertNotIn(Ellipsis, d)
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# Tuple of Ellipses
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d[..., ...] = 1
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self.assertEqual(d[..., ...], 1)
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d[..., ...] += 1
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self.assertEqual(d[..., ...], 2)
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del d[..., ...]
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self.assertNotIn((Ellipsis, Ellipsis), d)
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|
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def test_annotation_limit(self):
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# more than 255 annotations, should compile ok
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s = "def f(%s): pass"
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s %= ', '.join('a%d:%d' % (i,i) for i in range(300))
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compile(s, '?', 'exec')
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|
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def test_mangling(self):
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class A:
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def f():
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__mangled = 1
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__not_mangled__ = 2
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import __mangled_mod
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import __package__.module
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self.assertIn("_A__mangled", A.f.__code__.co_varnames)
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self.assertIn("__not_mangled__", A.f.__code__.co_varnames)
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self.assertIn("_A__mangled_mod", A.f.__code__.co_varnames)
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self.assertIn("__package__", A.f.__code__.co_varnames)
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def test_compile_ast(self):
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fname = __file__
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if fname.lower().endswith('pyc'):
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fname = fname[:-1]
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with open(fname, 'r') as f:
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fcontents = f.read()
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sample_code = [
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['<assign>', 'x = 5'],
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['<ifblock>', """if True:\n pass\n"""],
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['<forblock>', """for n in [1, 2, 3]:\n print(n)\n"""],
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['<deffunc>', """def foo():\n pass\nfoo()\n"""],
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[fname, fcontents],
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]
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for fname, code in sample_code:
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co1 = compile(code, '%s1' % fname, 'exec')
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ast = compile(code, '%s2' % fname, 'exec', _ast.PyCF_ONLY_AST)
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self.assertTrue(type(ast) == _ast.Module)
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co2 = compile(ast, '%s3' % fname, 'exec')
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self.assertEqual(co1, co2)
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# the code object's filename comes from the second compilation step
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self.assertEqual(co2.co_filename, '%s3' % fname)
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|
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# raise exception when node type doesn't match with compile mode
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co1 = compile('print(1)', '<string>', 'exec', _ast.PyCF_ONLY_AST)
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self.assertRaises(TypeError, compile, co1, '<ast>', 'eval')
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# raise exception when node type is no start node
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self.assertRaises(TypeError, compile, _ast.If(), '<ast>', 'exec')
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# raise exception when node has invalid children
|
|
ast = _ast.Module()
|
|
ast.body = [_ast.BoolOp()]
|
|
self.assertRaises(TypeError, compile, ast, '<ast>', 'exec')
|
|
|
|
def test_dict_evaluation_order(self):
|
|
i = 0
|
|
|
|
def f():
|
|
nonlocal i
|
|
i += 1
|
|
return i
|
|
|
|
d = {f(): f(), f(): f()}
|
|
self.assertEqual(d, {1: 2, 3: 4})
|
|
|
|
def test_compile_filename(self):
|
|
for filename in 'file.py', b'file.py':
|
|
code = compile('pass', filename, 'exec')
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
for filename in bytearray(b'file.py'), memoryview(b'file.py'):
|
|
with self.assertWarns(DeprecationWarning):
|
|
code = compile('pass', filename, 'exec')
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
self.assertRaises(TypeError, compile, 'pass', list(b'file.py'), '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')
|
|
|
|
def test_particularly_evil_undecodable(self):
|
|
# Issue 24022
|
|
src = b'0000\x00\n00000000000\n\x00\n\x9e\n'
|
|
with tempfile.TemporaryDirectory() as tmpd:
|
|
fn = os.path.join(tmpd, "bad.py")
|
|
with open(fn, "wb") as fp:
|
|
fp.write(src)
|
|
res = script_helper.run_python_until_end(fn)[0]
|
|
self.assertIn(b"Non-UTF-8", res.err)
|
|
|
|
def test_yet_more_evil_still_undecodable(self):
|
|
# Issue #25388
|
|
src = b"#\x00\n#\xfd\n"
|
|
with tempfile.TemporaryDirectory() as tmpd:
|
|
fn = os.path.join(tmpd, "bad.py")
|
|
with open(fn, "wb") as fp:
|
|
fp.write(src)
|
|
res = script_helper.run_python_until_end(fn)[0]
|
|
self.assertIn(b"Non-UTF-8", res.err)
|
|
|
|
@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(RecursionError, msg=details):
|
|
self.compile_single(broken)
|
|
|
|
check_limit("a", "()")
|
|
check_limit("a", ".b")
|
|
check_limit("a", "[0]")
|
|
check_limit("a", "*a")
|
|
|
|
def test_null_terminated(self):
|
|
# The source code is null-terminated internally, but bytes-like
|
|
# objects are accepted, which could be not terminated.
|
|
with self.assertRaisesRegex(ValueError, "cannot contain null"):
|
|
compile("123\x00", "<dummy>", "eval")
|
|
with self.assertRaisesRegex(ValueError, "cannot contain null"):
|
|
compile(memoryview(b"123\x00"), "<dummy>", "eval")
|
|
code = compile(memoryview(b"123\x00")[1:-1], "<dummy>", "eval")
|
|
self.assertEqual(eval(code), 23)
|
|
code = compile(memoryview(b"1234")[1:-1], "<dummy>", "eval")
|
|
self.assertEqual(eval(code), 23)
|
|
code = compile(memoryview(b"$23$")[1:-1], "<dummy>", "eval")
|
|
self.assertEqual(eval(code), 23)
|
|
|
|
# Also test when eval() and exec() do the compilation step
|
|
self.assertEqual(eval(memoryview(b"1234")[1:-1]), 23)
|
|
namespace = dict()
|
|
exec(memoryview(b"ax = 123")[1:-1], namespace)
|
|
self.assertEqual(namespace['x'], 12)
|
|
|
|
def check_constant(self, func, expected):
|
|
for const in func.__code__.co_consts:
|
|
if repr(const) == repr(expected):
|
|
break
|
|
else:
|
|
self.fail("unable to find constant %r in %r"
|
|
% (expected, func.__code__.co_consts))
|
|
|
|
# Merging equal constants is not a strict requirement for the Python
|
|
# semantics, it's a more an implementation detail.
|
|
@support.cpython_only
|
|
def test_merge_constants(self):
|
|
# Issue #25843: compile() must merge constants which are equal
|
|
# and have the same type.
|
|
|
|
def check_same_constant(const):
|
|
ns = {}
|
|
code = "f1, f2 = lambda: %r, lambda: %r" % (const, const)
|
|
exec(code, ns)
|
|
f1 = ns['f1']
|
|
f2 = ns['f2']
|
|
self.assertIs(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, const)
|
|
self.assertEqual(repr(f1()), repr(const))
|
|
|
|
check_same_constant(None)
|
|
check_same_constant(0)
|
|
check_same_constant(0.0)
|
|
check_same_constant(b'abc')
|
|
check_same_constant('abc')
|
|
|
|
# Note: "lambda: ..." emits "LOAD_CONST Ellipsis",
|
|
# whereas "lambda: Ellipsis" emits "LOAD_GLOBAL Ellipsis"
|
|
f1, f2 = lambda: ..., lambda: ...
|
|
self.assertIs(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, Ellipsis)
|
|
self.assertEqual(repr(f1()), repr(Ellipsis))
|
|
|
|
# Merge constants in tuple or frozenset
|
|
f1, f2 = lambda: "not a name", lambda: ("not a name",)
|
|
f3 = lambda x: x in {("not a name",)}
|
|
self.assertIs(f1.__code__.co_consts[1],
|
|
f2.__code__.co_consts[1][0])
|
|
self.assertIs(next(iter(f3.__code__.co_consts[1])),
|
|
f2.__code__.co_consts[1])
|
|
|
|
# {0} is converted to a constant frozenset({0}) by the peephole
|
|
# optimizer
|
|
f1, f2 = lambda x: x in {0}, lambda x: x in {0}
|
|
self.assertIs(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, frozenset({0}))
|
|
self.assertTrue(f1(0))
|
|
|
|
# This is a regression test for a CPython specific peephole optimizer
|
|
# implementation bug present in a few releases. It's assertion verifies
|
|
# that peephole optimization was actually done though that isn't an
|
|
# indication of the bugs presence or not (crashing is).
|
|
@support.cpython_only
|
|
def test_peephole_opt_unreachable_code_array_access_in_bounds(self):
|
|
"""Regression test for issue35193 when run under clang msan."""
|
|
def unused_code_at_end():
|
|
return 3
|
|
raise RuntimeError("unreachable")
|
|
# The above function definition will trigger the out of bounds
|
|
# bug in the peephole optimizer as it scans opcodes past the
|
|
# RETURN_VALUE opcode. This does not always crash an interpreter.
|
|
# When you build with the clang memory sanitizer it reliably aborts.
|
|
self.assertEqual(
|
|
'RETURN_VALUE',
|
|
list(dis.get_instructions(unused_code_at_end))[-1].opname)
|
|
|
|
def test_dont_merge_constants(self):
|
|
# Issue #25843: compile() must not merge constants which are equal
|
|
# but have a different type.
|
|
|
|
def check_different_constants(const1, const2):
|
|
ns = {}
|
|
exec("f1, f2 = lambda: %r, lambda: %r" % (const1, const2), ns)
|
|
f1 = ns['f1']
|
|
f2 = ns['f2']
|
|
self.assertIsNot(f1.__code__, f2.__code__)
|
|
self.assertNotEqual(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, const1)
|
|
self.check_constant(f2, const2)
|
|
self.assertEqual(repr(f1()), repr(const1))
|
|
self.assertEqual(repr(f2()), repr(const2))
|
|
|
|
check_different_constants(0, 0.0)
|
|
check_different_constants(+0.0, -0.0)
|
|
check_different_constants((0,), (0.0,))
|
|
check_different_constants('a', b'a')
|
|
check_different_constants(('a',), (b'a',))
|
|
|
|
# check_different_constants() cannot be used because repr(-0j) is
|
|
# '(-0-0j)', but when '(-0-0j)' is evaluated to 0j: we loose the sign.
|
|
f1, f2 = lambda: +0.0j, lambda: -0.0j
|
|
self.assertIsNot(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, +0.0j)
|
|
self.check_constant(f2, -0.0j)
|
|
self.assertEqual(repr(f1()), repr(+0.0j))
|
|
self.assertEqual(repr(f2()), repr(-0.0j))
|
|
|
|
# {0} is converted to a constant frozenset({0}) by the peephole
|
|
# optimizer
|
|
f1, f2 = lambda x: x in {0}, lambda x: x in {0.0}
|
|
self.assertIsNot(f1.__code__, f2.__code__)
|
|
self.check_constant(f1, frozenset({0}))
|
|
self.check_constant(f2, frozenset({0.0}))
|
|
self.assertTrue(f1(0))
|
|
self.assertTrue(f2(0.0))
|
|
|
|
def test_path_like_objects(self):
|
|
# An implicit test for PyUnicode_FSDecoder().
|
|
compile("42", FakePath("test_compile_pathlike"), "single")
|
|
|
|
def test_stack_overflow(self):
|
|
# bpo-31113: Stack overflow when compile a long sequence of
|
|
# complex statements.
|
|
compile("if a: b\n" * 200000, "<dummy>", "exec")
|
|
|
|
# Multiple users rely on the fact that CPython does not generate
|
|
# bytecode for dead code blocks. See bpo-37500 for more context.
|
|
@support.cpython_only
|
|
def test_dead_blocks_do_not_generate_bytecode(self):
|
|
def unused_block_if():
|
|
if 0:
|
|
return 42
|
|
|
|
def unused_block_while():
|
|
while 0:
|
|
return 42
|
|
|
|
def unused_block_if_else():
|
|
if 1:
|
|
return None
|
|
else:
|
|
return 42
|
|
|
|
def unused_block_while_else():
|
|
while 1:
|
|
return None
|
|
else:
|
|
return 42
|
|
|
|
funcs = [unused_block_if, unused_block_while,
|
|
unused_block_if_else, unused_block_while_else]
|
|
|
|
for func in funcs:
|
|
opcodes = list(dis.get_instructions(func))
|
|
self.assertEqual(2, len(opcodes))
|
|
self.assertEqual('LOAD_CONST', opcodes[0].opname)
|
|
self.assertEqual(None, opcodes[0].argval)
|
|
self.assertEqual('RETURN_VALUE', opcodes[1].opname)
|
|
|
|
def test_false_while_loop(self):
|
|
def break_in_while():
|
|
while False:
|
|
break
|
|
|
|
def continue_in_while():
|
|
while False:
|
|
continue
|
|
|
|
funcs = [break_in_while, continue_in_while]
|
|
|
|
# Check that we did not raise but we also don't generate bytecode
|
|
for func in funcs:
|
|
opcodes = list(dis.get_instructions(func))
|
|
self.assertEqual(2, len(opcodes))
|
|
self.assertEqual('LOAD_CONST', opcodes[0].opname)
|
|
self.assertEqual(None, opcodes[0].argval)
|
|
self.assertEqual('RETURN_VALUE', opcodes[1].opname)
|
|
|
|
def test_big_dict_literal(self):
|
|
# The compiler has a flushing point in "compiler_dict" that calls compiles
|
|
# a portion of the dictionary literal when the loop that iterates over the items
|
|
# reaches 0xFFFF elements but the code was not including the boundary element,
|
|
# dropping the key at position 0xFFFF. See bpo-41531 for more information
|
|
|
|
dict_size = 0xFFFF + 1
|
|
the_dict = "{" + ",".join(f"{x}:{x}" for x in range(dict_size)) + "}"
|
|
self.assertEqual(len(eval(the_dict)), dict_size)
|
|
|
|
class TestExpressionStackSize(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)
|
|
|
|
|
|
class TestStackSizeStability(unittest.TestCase):
|
|
# Check that repeating certain snippets doesn't increase the stack size
|
|
# beyond what a single snippet requires.
|
|
|
|
def check_stack_size(self, snippet, async_=False):
|
|
def compile_snippet(i):
|
|
ns = {}
|
|
script = """def func():\n""" + i * snippet
|
|
if async_:
|
|
script = "async " + script
|
|
code = compile(script, "<script>", "exec")
|
|
exec(code, ns, ns)
|
|
return ns['func'].__code__
|
|
|
|
sizes = [compile_snippet(i).co_stacksize for i in range(2, 5)]
|
|
if len(set(sizes)) != 1:
|
|
import dis, io
|
|
out = io.StringIO()
|
|
dis.dis(compile_snippet(1), file=out)
|
|
self.fail("stack sizes diverge with # of consecutive snippets: "
|
|
"%s\n%s\n%s" % (sizes, snippet, out.getvalue()))
|
|
|
|
def test_if(self):
|
|
snippet = """
|
|
if x:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_if_else(self):
|
|
snippet = """
|
|
if x:
|
|
a
|
|
elif y:
|
|
b
|
|
else:
|
|
c
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_try_except_bare(self):
|
|
snippet = """
|
|
try:
|
|
a
|
|
except:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_try_except_qualified(self):
|
|
snippet = """
|
|
try:
|
|
a
|
|
except ImportError:
|
|
b
|
|
except:
|
|
c
|
|
else:
|
|
d
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_try_except_as(self):
|
|
snippet = """
|
|
try:
|
|
a
|
|
except ImportError as e:
|
|
b
|
|
except:
|
|
c
|
|
else:
|
|
d
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_try_finally(self):
|
|
snippet = """
|
|
try:
|
|
a
|
|
finally:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_with(self):
|
|
snippet = """
|
|
with x as y:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_while_else(self):
|
|
snippet = """
|
|
while x:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for(self):
|
|
snippet = """
|
|
for x in y:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_else(self):
|
|
snippet = """
|
|
for x in y:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_break_continue(self):
|
|
snippet = """
|
|
for x in y:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_break_continue_inside_try_finally_block(self):
|
|
snippet = """
|
|
for x in y:
|
|
try:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
finally:
|
|
f
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_break_continue_inside_finally_block(self):
|
|
snippet = """
|
|
for x in y:
|
|
try:
|
|
t
|
|
finally:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_break_continue_inside_except_block(self):
|
|
snippet = """
|
|
for x in y:
|
|
try:
|
|
t
|
|
except:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_for_break_continue_inside_with_block(self):
|
|
snippet = """
|
|
for x in y:
|
|
with c:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_return_inside_try_finally_block(self):
|
|
snippet = """
|
|
try:
|
|
if z:
|
|
return
|
|
else:
|
|
a
|
|
finally:
|
|
f
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_return_inside_finally_block(self):
|
|
snippet = """
|
|
try:
|
|
t
|
|
finally:
|
|
if z:
|
|
return
|
|
else:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_return_inside_except_block(self):
|
|
snippet = """
|
|
try:
|
|
t
|
|
except:
|
|
if z:
|
|
return
|
|
else:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_return_inside_with_block(self):
|
|
snippet = """
|
|
with c:
|
|
if z:
|
|
return
|
|
else:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet)
|
|
|
|
def test_async_with(self):
|
|
snippet = """
|
|
async with x as y:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet, async_=True)
|
|
|
|
def test_async_for(self):
|
|
snippet = """
|
|
async for x in y:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet, async_=True)
|
|
|
|
def test_async_for_else(self):
|
|
snippet = """
|
|
async for x in y:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet, async_=True)
|
|
|
|
def test_for_break_continue_inside_async_with_block(self):
|
|
snippet = """
|
|
for x in y:
|
|
async with c:
|
|
if z:
|
|
break
|
|
elif u:
|
|
continue
|
|
else:
|
|
a
|
|
else:
|
|
b
|
|
"""
|
|
self.check_stack_size(snippet, async_=True)
|
|
|
|
def test_return_inside_async_with_block(self):
|
|
snippet = """
|
|
async with c:
|
|
if z:
|
|
return
|
|
else:
|
|
a
|
|
"""
|
|
self.check_stack_size(snippet, async_=True)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|