import gc import pprint import sys import unittest from test import support class TestGetProfile(unittest.TestCase): def setUp(self): sys.setprofile(None) def tearDown(self): sys.setprofile(None) def test_empty(self): self.assertIsNone(sys.getprofile()) def test_setget(self): def fn(*args): pass sys.setprofile(fn) self.assertIs(sys.getprofile(), fn) class HookWatcher: def __init__(self): self.frames = [] self.events = [] def callback(self, frame, event, arg): if (event == "call" or event == "return" or event == "exception"): self.add_event(event, frame) def add_event(self, event, frame=None): """Add an event to the log.""" if frame is None: frame = sys._getframe(1) try: frameno = self.frames.index(frame) except ValueError: frameno = len(self.frames) self.frames.append(frame) self.events.append((frameno, event, ident(frame))) def get_events(self): """Remove calls to add_event().""" disallowed = [ident(self.add_event.__func__), ident(ident)] self.frames = None return [item for item in self.events if item[2] not in disallowed] class ProfileSimulator(HookWatcher): def __init__(self, testcase): self.testcase = testcase self.stack = [] HookWatcher.__init__(self) def callback(self, frame, event, arg): # Callback registered with sys.setprofile()/sys.settrace() self.dispatch[event](self, frame) def trace_call(self, frame): self.add_event('call', frame) self.stack.append(frame) def trace_return(self, frame): self.add_event('return', frame) self.stack.pop() def trace_exception(self, frame): self.testcase.fail( "the profiler should never receive exception events") def trace_pass(self, frame): pass dispatch = { 'call': trace_call, 'exception': trace_exception, 'return': trace_return, 'c_call': trace_pass, 'c_return': trace_pass, 'c_exception': trace_pass, } class TestCaseBase(unittest.TestCase): def check_events(self, callable, expected): events = capture_events(callable, self.new_watcher()) if events != expected: self.fail("Expected events:\n%s\nReceived events:\n%s" % (pprint.pformat(expected), pprint.pformat(events))) class ProfileHookTestCase(TestCaseBase): def new_watcher(self): return HookWatcher() def test_simple(self): def f(p): pass f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_exception(self): def f(p): 1/0 f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_caught_exception(self): def f(p): try: 1/0 except: pass f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_caught_nested_exception(self): def f(p): try: 1/0 except: pass f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_nested_exception(self): def f(p): 1/0 f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), # This isn't what I expected: # (0, 'exception', protect_ident), # I expected this again: (1, 'return', f_ident), ]) def test_exception_in_except_clause(self): def f(p): 1/0 def g(p): try: f(p) except: try: f(p) except: pass f_ident = ident(f) g_ident = ident(g) self.check_events(g, [(1, 'call', g_ident), (2, 'call', f_ident), (2, 'return', f_ident), (3, 'call', f_ident), (3, 'return', f_ident), (1, 'return', g_ident), ]) def test_exception_propogation(self): def f(p): 1/0 def g(p): try: f(p) finally: p.add_event("falling through") f_ident = ident(f) g_ident = ident(g) self.check_events(g, [(1, 'call', g_ident), (2, 'call', f_ident), (2, 'return', f_ident), (1, 'falling through', g_ident), (1, 'return', g_ident), ]) def test_raise_twice(self): def f(p): try: 1/0 except: 1/0 f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_raise_reraise(self): def f(p): try: 1/0 except: raise f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_raise(self): def f(p): raise Exception() f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_distant_exception(self): def f(): 1/0 def g(): f() def h(): g() def i(): h() def j(p): i() f_ident = ident(f) g_ident = ident(g) h_ident = ident(h) i_ident = ident(i) j_ident = ident(j) self.check_events(j, [(1, 'call', j_ident), (2, 'call', i_ident), (3, 'call', h_ident), (4, 'call', g_ident), (5, 'call', f_ident), (5, 'return', f_ident), (4, 'return', g_ident), (3, 'return', h_ident), (2, 'return', i_ident), (1, 'return', j_ident), ]) def test_generator(self): def f(): for i in range(2): yield i def g(p): for i in f(): pass f_ident = ident(f) g_ident = ident(g) self.check_events(g, [(1, 'call', g_ident), # call the iterator twice to generate values (2, 'call', f_ident), (2, 'return', f_ident), (2, 'call', f_ident), (2, 'return', f_ident), # once more; returns end-of-iteration with # actually raising an exception (2, 'call', f_ident), (2, 'return', f_ident), (1, 'return', g_ident), ]) def test_stop_iteration(self): def f(): for i in range(2): yield i def g(p): for i in f(): pass f_ident = ident(f) g_ident = ident(g) self.check_events(g, [(1, 'call', g_ident), # call the iterator twice to generate values (2, 'call', f_ident), (2, 'return', f_ident), (2, 'call', f_ident), (2, 'return', f_ident), # once more to hit the raise: (2, 'call', f_ident), (2, 'return', f_ident), (1, 'return', g_ident), ]) class ProfileSimulatorTestCase(TestCaseBase): def new_watcher(self): return ProfileSimulator(self) def test_simple(self): def f(p): pass f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_basic_exception(self): def f(p): 1/0 f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_caught_exception(self): def f(p): try: 1/0 except: pass f_ident = ident(f) self.check_events(f, [(1, 'call', f_ident), (1, 'return', f_ident), ]) def test_distant_exception(self): def f(): 1/0 def g(): f() def h(): g() def i(): h() def j(p): i() f_ident = ident(f) g_ident = ident(g) h_ident = ident(h) i_ident = ident(i) j_ident = ident(j) self.check_events(j, [(1, 'call', j_ident), (2, 'call', i_ident), (3, 'call', h_ident), (4, 'call', g_ident), (5, 'call', f_ident), (5, 'return', f_ident), (4, 'return', g_ident), (3, 'return', h_ident), (2, 'return', i_ident), (1, 'return', j_ident), ]) def ident(function): if hasattr(function, "f_code"): code = function.f_code else: code = function.__code__ return code.co_firstlineno, code.co_name def protect(f, p): try: f(p) except: pass protect_ident = ident(protect) def capture_events(callable, p=None): if p is None: p = HookWatcher() # Disable the garbage collector. This prevents __del__s from showing up in # traces. old_gc = gc.isenabled() gc.disable() try: sys.setprofile(p.callback) protect(callable, p) sys.setprofile(None) finally: if old_gc: gc.enable() return p.get_events()[1:-1] def show_events(callable): import pprint pprint.pprint(capture_events(callable)) def test_main(): support.run_unittest( TestGetProfile, ProfileHookTestCase, ProfileSimulatorTestCase ) if __name__ == "__main__": test_main()