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99 lines
3.1 KiB
99 lines
3.1 KiB
3 years ago
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import opcode
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import re
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import sys
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import textwrap
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import unittest
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from test.support import os_helper, verbose
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from test.support.script_helper import assert_python_ok
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Py_DEBUG = hasattr(sys, 'gettotalrefcount')
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@unittest.skipUnless(Py_DEBUG, "lltrace requires Py_DEBUG")
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class TestLLTrace(unittest.TestCase):
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def test_lltrace_does_not_crash_on_subscript_operator(self):
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# If this test fails, it will reproduce a crash reported as
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# bpo-34113. The crash happened at the command line console of
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# debug Python builds with __ltrace__ enabled (only possible in console),
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# when the internal Python stack was negatively adjusted
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with open(os_helper.TESTFN, 'w', encoding='utf-8') as fd:
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self.addCleanup(os_helper.unlink, os_helper.TESTFN)
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fd.write(textwrap.dedent("""\
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import code
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console = code.InteractiveConsole()
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console.push('__ltrace__ = 1')
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console.push('a = [1, 2, 3]')
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console.push('a[0] = 1')
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print('unreachable if bug exists')
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"""))
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assert_python_ok(os_helper.TESTFN)
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def run_code(self, code):
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code = textwrap.dedent(code).strip()
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with open(os_helper.TESTFN, 'w', encoding='utf-8') as fd:
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self.addCleanup(os_helper.unlink, os_helper.TESTFN)
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fd.write(code)
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status, stdout, stderr = assert_python_ok(os_helper.TESTFN)
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self.assertEqual(stderr, b"")
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self.assertEqual(status, 0)
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result = stdout.decode('utf-8')
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if verbose:
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print("\n\n--- code ---")
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print(code)
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print("\n--- stdout ---")
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print(result)
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print()
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return result
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def check_op(self, op, stdout, present):
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op = opcode.opmap[op]
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regex = re.compile(f': {op}($|, )', re.MULTILINE)
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if present:
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self.assertTrue(regex.search(stdout),
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f'": {op}" not found in: {stdout}')
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else:
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self.assertFalse(regex.search(stdout),
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f'": {op}" found in: {stdout}')
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def check_op_in(self, op, stdout):
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self.check_op(op, stdout, True)
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def check_op_not_in(self, op, stdout):
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self.check_op(op, stdout, False)
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def test_lltrace(self):
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stdout = self.run_code("""
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def dont_trace_1():
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a = "a"
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a = 10 * a
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def trace_me():
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for i in range(3):
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+i
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def dont_trace_2():
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x = 42
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y = -x
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dont_trace_1()
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__ltrace__ = 1
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trace_me()
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del __ltrace__
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dont_trace_2()
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""")
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self.check_op_in("GET_ITER", stdout)
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self.check_op_in("FOR_ITER", stdout)
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self.check_op_in("UNARY_POSITIVE", stdout)
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self.check_op_in("POP_TOP", stdout)
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# before: dont_trace_1() is not traced
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self.check_op_not_in("BINARY_MULTIPLY", stdout)
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# after: dont_trace_2() is not traced
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self.check_op_not_in("UNARY_NEGATIVE", stdout)
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if __name__ == "__main__":
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unittest.main()
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