# Minimal tests for dis module from test.support import run_unittest, captured_stdout import difflib import unittest import sys import dis import io class _C: def __init__(self, x): self.x = x == 1 dis_c_instance_method = """\ %-4d 0 LOAD_FAST 1 (x) 3 LOAD_CONST 1 (1) 6 COMPARE_OP 2 (==) 9 LOAD_FAST 0 (self) 12 STORE_ATTR 0 (x) 15 LOAD_CONST 0 (None) 18 RETURN_VALUE """ % (_C.__init__.__code__.co_firstlineno + 1,) dis_c_instance_method_bytes = """\ 0 LOAD_FAST 1 (1) 3 LOAD_CONST 1 (1) 6 COMPARE_OP 2 (==) 9 LOAD_FAST 0 (0) 12 STORE_ATTR 0 (0) 15 LOAD_CONST 0 (0) 18 RETURN_VALUE """ def _f(a): print(a) return 1 dis_f = """\ %-4d 0 LOAD_GLOBAL 0 (print) 3 LOAD_FAST 0 (a) 6 CALL_FUNCTION 1 (1 positional, 0 keyword pair) 9 POP_TOP %-4d 10 LOAD_CONST 1 (1) 13 RETURN_VALUE """ % (_f.__code__.co_firstlineno + 1, _f.__code__.co_firstlineno + 2) dis_f_co_code = """\ 0 LOAD_GLOBAL 0 (0) 3 LOAD_FAST 0 (0) 6 CALL_FUNCTION 1 (1 positional, 0 keyword pair) 9 POP_TOP 10 LOAD_CONST 1 (1) 13 RETURN_VALUE """ def bug708901(): for res in range(1, 10): pass dis_bug708901 = """\ %-4d 0 SETUP_LOOP 23 (to 26) 3 LOAD_GLOBAL 0 (range) 6 LOAD_CONST 1 (1) %-4d 9 LOAD_CONST 2 (10) 12 CALL_FUNCTION 2 (2 positional, 0 keyword pair) 15 GET_ITER >> 16 FOR_ITER 6 (to 25) 19 STORE_FAST 0 (res) %-4d 22 JUMP_ABSOLUTE 16 >> 25 POP_BLOCK >> 26 LOAD_CONST 0 (None) 29 RETURN_VALUE """ % (bug708901.__code__.co_firstlineno + 1, bug708901.__code__.co_firstlineno + 2, bug708901.__code__.co_firstlineno + 3) def bug1333982(x=[]): assert 0, ([s for s in x] + 1) pass dis_bug1333982 = """\ %-4d 0 LOAD_CONST 1 (0) 3 JUMP_IF_TRUE 33 (to 39) 6 POP_TOP 7 LOAD_GLOBAL 0 (AssertionError) 10 BUILD_LIST 0 13 LOAD_FAST 0 (x) 16 GET_ITER >> 17 FOR_ITER 12 (to 32) 20 STORE_FAST 1 (s) 23 LOAD_FAST 1 (s) 26 LIST_APPEND 2 29 JUMP_ABSOLUTE 17 %-4d >> 32 LOAD_CONST 2 (1) 35 BINARY_ADD 36 RAISE_VARARGS 2 >> 39 POP_TOP %-4d 40 LOAD_CONST 0 (None) 43 RETURN_VALUE """ % (bug1333982.__code__.co_firstlineno + 1, bug1333982.__code__.co_firstlineno + 2, bug1333982.__code__.co_firstlineno + 3) _BIG_LINENO_FORMAT = """\ %3d 0 LOAD_GLOBAL 0 (spam) 3 POP_TOP 4 LOAD_CONST 0 (None) 7 RETURN_VALUE """ dis_module_expected_results = """\ Disassembly of f: 4 0 LOAD_CONST 0 (None) 3 RETURN_VALUE Disassembly of g: 5 0 LOAD_CONST 0 (None) 3 RETURN_VALUE """ expr_str = "x + 1" dis_expr_str = """\ 1 0 LOAD_NAME 0 (x) 3 LOAD_CONST 0 (1) 6 BINARY_ADD 7 RETURN_VALUE """ simple_stmt_str = "x = x + 1" dis_simple_stmt_str = """\ 1 0 LOAD_NAME 0 (x) 3 LOAD_CONST 0 (1) 6 BINARY_ADD 7 STORE_NAME 0 (x) 10 LOAD_CONST 1 (None) 13 RETURN_VALUE """ compound_stmt_str = """\ x = 0 while 1: x += 1""" # Trailing newline has been deliberately omitted dis_compound_stmt_str = """\ 1 0 LOAD_CONST 0 (0) 3 STORE_NAME 0 (x) 2 6 SETUP_LOOP 13 (to 22) 3 >> 9 LOAD_NAME 0 (x) 12 LOAD_CONST 1 (1) 15 INPLACE_ADD 16 STORE_NAME 0 (x) 19 JUMP_ABSOLUTE 9 >> 22 LOAD_CONST 2 (None) 25 RETURN_VALUE """ class DisTests(unittest.TestCase): def get_disassembly(self, func, lasti=-1, wrapper=True): s = io.StringIO() save_stdout = sys.stdout sys.stdout = s try: if wrapper: dis.dis(func) else: dis.disassemble(func, lasti) finally: sys.stdout = save_stdout # Trim trailing blanks (if any). return [line.rstrip() for line in s.getvalue().splitlines()] def get_disassemble_as_string(self, func, lasti=-1): return '\n'.join(self.get_disassembly(func, lasti, False)) def do_disassembly_test(self, func, expected): lines = self.get_disassembly(func) expected = expected.splitlines() if expected != lines: self.fail( "events did not match expectation:\n" + "\n".join(difflib.ndiff(expected, lines))) def test_opmap(self): self.assertEqual(dis.opmap["NOP"], 9) self.assertIn(dis.opmap["LOAD_CONST"], dis.hasconst) self.assertIn(dis.opmap["STORE_NAME"], dis.hasname) def test_opname(self): self.assertEqual(dis.opname[dis.opmap["LOAD_FAST"]], "LOAD_FAST") def test_boundaries(self): self.assertEqual(dis.opmap["EXTENDED_ARG"], dis.EXTENDED_ARG) self.assertEqual(dis.opmap["STORE_NAME"], dis.HAVE_ARGUMENT) def test_dis(self): self.do_disassembly_test(_f, dis_f) def test_bug_708901(self): self.do_disassembly_test(bug708901, dis_bug708901) def test_bug_1333982(self): # XXX: re-enable this test! # This one is checking bytecodes generated for an `assert` statement, # so fails if the tests are run with -O. Skip this test then. pass # Test has been disabled due to change in the way # list comps are handled. The byte code now includes # a memory address and a file location, so they change from # run to run. # if __debug__: # self.do_disassembly_test(bug1333982, dis_bug1333982) def test_big_linenos(self): def func(count): namespace = {} func = "def foo():\n " + "".join(["\n "] * count + ["spam\n"]) exec(func, namespace) return namespace['foo'] # Test all small ranges for i in range(1, 300): expected = _BIG_LINENO_FORMAT % (i + 2) self.do_disassembly_test(func(i), expected) # Test some larger ranges too for i in range(300, 5000, 10): expected = _BIG_LINENO_FORMAT % (i + 2) self.do_disassembly_test(func(i), expected) def test_big_linenos(self): from test import dis_module self.do_disassembly_test(dis_module, dis_module_expected_results) def test_disassemble_str(self): self.do_disassembly_test(expr_str, dis_expr_str) self.do_disassembly_test(simple_stmt_str, dis_simple_stmt_str) self.do_disassembly_test(compound_stmt_str, dis_compound_stmt_str) def test_disassemble_bytes(self): self.do_disassembly_test(_f.__code__.co_code, dis_f_co_code) def test_disassemble_method(self): self.do_disassembly_test(_C(1).__init__, dis_c_instance_method) def test_disassemble_method_bytes(self): method_bytecode = _C(1).__init__.__code__.co_code self.do_disassembly_test(method_bytecode, dis_c_instance_method_bytes) def test_dis_none(self): try: del sys.last_traceback except AttributeError: pass self.assertRaises(RuntimeError, dis.dis, None) def test_dis_object(self): self.assertRaises(TypeError, dis.dis, object()) def test_dis_traceback(self): try: del sys.last_traceback except AttributeError: pass try: 1/0 except Exception as e: tb = e.__traceback__ sys.last_traceback = tb tb_dis = self.get_disassemble_as_string(tb.tb_frame.f_code, tb.tb_lasti) self.do_disassembly_test(None, tb_dis) def test_dis_object(self): self.assertRaises(TypeError, dis.dis, object()) code_info_code_info = """\ Name: code_info Filename: (.*) Argument count: 1 Kw-only arguments: 0 Number of locals: 1 Stack size: 4 Flags: OPTIMIZED, NEWLOCALS, NOFREE Constants: 0: %r 1: '__func__' 2: '__code__' 3: '' 4: 'co_code' 5: "don't know how to disassemble %%s objects" %sNames: 0: hasattr 1: __func__ 2: __code__ 3: isinstance 4: str 5: _try_compile 6: _format_code_info 7: TypeError 8: type 9: __name__ Variable names: 0: x""" % (('Formatted details of methods, functions, or code.', ' 6: None\n') if sys.flags.optimize < 2 else (None, '')) @staticmethod def tricky(x, y, z=True, *args, c, d, e=[], **kwds): def f(c=c): print(x, y, z, c, d, e, f) yield x, y, z, c, d, e, f code_info_tricky = """\ Name: tricky Filename: (.*) Argument count: 3 Kw-only arguments: 3 Number of locals: 8 Stack size: 7 Flags: OPTIMIZED, NEWLOCALS, VARARGS, VARKEYWORDS, GENERATOR Constants: 0: None 1: 2: 'tricky..f' Variable names: 0: x 1: y 2: z 3: c 4: d 5: e 6: args 7: kwds Cell variables: 0: [edfxyz] 1: [edfxyz] 2: [edfxyz] 3: [edfxyz] 4: [edfxyz] 5: [edfxyz]""" # NOTE: the order of the cell variables above depends on dictionary order! co_tricky_nested_f = tricky.__func__.__code__.co_consts[1] code_info_tricky_nested_f = """\ Name: f Filename: (.*) Argument count: 1 Kw-only arguments: 0 Number of locals: 1 Stack size: 8 Flags: OPTIMIZED, NEWLOCALS, NESTED Constants: 0: None Names: 0: print Variable names: 0: c Free variables: 0: [edfxyz] 1: [edfxyz] 2: [edfxyz] 3: [edfxyz] 4: [edfxyz] 5: [edfxyz]""" code_info_expr_str = """\ Name: Filename: Argument count: 0 Kw-only arguments: 0 Number of locals: 0 Stack size: 2 Flags: NOFREE Constants: 0: 1 Names: 0: x""" code_info_simple_stmt_str = """\ Name: Filename: Argument count: 0 Kw-only arguments: 0 Number of locals: 0 Stack size: 2 Flags: NOFREE Constants: 0: 1 1: None Names: 0: x""" code_info_compound_stmt_str = """\ Name: Filename: Argument count: 0 Kw-only arguments: 0 Number of locals: 0 Stack size: 2 Flags: NOFREE Constants: 0: 0 1: 1 2: None Names: 0: x""" class CodeInfoTests(unittest.TestCase): test_pairs = [ (dis.code_info, code_info_code_info), (tricky, code_info_tricky), (co_tricky_nested_f, code_info_tricky_nested_f), (expr_str, code_info_expr_str), (simple_stmt_str, code_info_simple_stmt_str), (compound_stmt_str, code_info_compound_stmt_str), ] def test_code_info(self): self.maxDiff = 1000 for x, expected in self.test_pairs: self.assertRegex(dis.code_info(x), expected) def test_show_code(self): self.maxDiff = 1000 for x, expected in self.test_pairs: with captured_stdout() as output: dis.show_code(x) self.assertRegex(output.getvalue(), expected+"\n") def test_code_info_object(self): self.assertRaises(TypeError, dis.code_info, object()) def test_pretty_flags_no_flags(self): self.assertEqual(dis.pretty_flags(0), '0x0') def test_main(): run_unittest(DisTests, CodeInfoTests) if __name__ == "__main__": test_main()