mirror of https://github.com/python/cpython
112 lines
3.7 KiB
Python
112 lines
3.7 KiB
Python
import dis
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import textwrap
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import unittest
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from test import support
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from test.support import os_helper
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from test.support.script_helper import assert_python_ok
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def example():
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x = []
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for i in range(0):
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x.append(i)
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x = "this is"
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y = "an example"
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print(x, y)
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@unittest.skipUnless(support.Py_DEBUG, "lltrace requires Py_DEBUG")
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class TestLLTrace(unittest.TestCase):
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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 support.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 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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__lltrace__ = 1
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trace_me()
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del __lltrace__
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dont_trace_2()
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""")
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self.assertIn("GET_ITER", stdout)
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self.assertIn("FOR_ITER", stdout)
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self.assertIn("UNARY_POSITIVE", stdout)
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self.assertIn("POP_TOP", stdout)
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self.assertNotIn("BINARY_OP", stdout)
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self.assertNotIn("UNARY_NEGATIVE", stdout)
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self.assertIn("'trace_me' in module '__main__'", stdout)
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self.assertNotIn("dont_trace_1", stdout)
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self.assertNotIn("'dont_trace_2' in module", stdout)
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def test_lltrace_different_module(self):
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stdout = self.run_code("""
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from test import test_lltrace
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test_lltrace.__lltrace__ = 1
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test_lltrace.example()
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""")
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self.assertIn("'example' in module 'test.test_lltrace'", stdout)
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self.assertIn('LOAD_CONST', stdout)
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self.assertIn('FOR_ITER', stdout)
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self.assertIn('this is an example', stdout)
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# check that offsets match the output of dis.dis()
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instr_map = {i.offset: i for i in dis.get_instructions(example, adaptive=True)}
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for line in stdout.splitlines():
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offset, colon, opname_oparg = line.partition(":")
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if not colon:
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continue
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offset = int(offset)
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opname_oparg = opname_oparg.split()
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if len(opname_oparg) == 2:
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opname, oparg = opname_oparg
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oparg = int(oparg)
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else:
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(opname,) = opname_oparg
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oparg = None
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self.assertEqual(instr_map[offset].opname, opname)
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self.assertEqual(instr_map[offset].arg, oparg)
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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 __lltrace__ enabled (only possible in console),
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# when the internal Python stack was negatively adjusted
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stdout = self.run_code("""
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import code
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console = code.InteractiveConsole()
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console.push('__lltrace__ = 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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self.assertIn("unreachable if bug exists", stdout)
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if __name__ == "__main__":
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unittest.main()
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