mirror of https://github.com/python/cpython
355 lines
10 KiB
Python
355 lines
10 KiB
Python
from __future__ import generators
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import pprint
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import sys
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import unittest
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import test_support
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class HookWatcher:
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def __init__(self):
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self.frames = []
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self.events = []
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def callback(self, frame, event, arg):
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self.add_event(event, frame)
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def add_event(self, event, frame=None):
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"""Add an event to the log."""
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if frame is None:
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frame = sys._getframe(1)
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try:
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frameno = self.frames.index(frame)
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except ValueError:
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frameno = len(self.frames)
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self.frames.append(frame)
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self.events.append((frameno, event, ident(frame)))
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def get_events(self):
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"""Remove calls to add_event()."""
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disallowed = [ident(self.add_event.im_func), ident(ident)]
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self.frames = None
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return [item for item in self.events if item[2] not in disallowed]
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class ProfileSimulator(HookWatcher):
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def __init__(self, testcase):
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self.testcase = testcase
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self.stack = []
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HookWatcher.__init__(self)
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def callback(self, frame, event, arg):
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# Callback registered with sys.setprofile()/sys.settrace()
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self.dispatch[event](self, frame)
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def trace_call(self, frame):
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self.add_event('call', frame)
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self.stack.append(frame)
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def trace_return(self, frame):
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self.add_event('return', frame)
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self.stack.pop()
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def trace_exception(self, frame):
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self.testcase.fail(
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"the profiler should never receive exception events")
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dispatch = {
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'call': trace_call,
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'exception': trace_exception,
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'return': trace_return,
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}
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class TestCaseBase(unittest.TestCase):
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def check_events(self, callable, expected):
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events = capture_events(callable, self.new_watcher())
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if events != expected:
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self.fail("Expected events:\n%s\nReceived events:\n%s"
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% (pprint.pformat(expected), pprint.pformat(events)))
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class ProfileHookTestCase(TestCaseBase):
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def new_watcher(self):
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return HookWatcher()
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def test_simple(self):
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def f(p):
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pass
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_exception(self):
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def f(p):
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1/0
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_caught_exception(self):
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def f(p):
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try: 1/0
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except: pass
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_caught_nested_exception(self):
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def f(p):
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try: 1/0
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except: pass
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_nested_exception(self):
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def f(p):
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1/0
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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# This isn't what I expected:
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# (0, 'exception', protect_ident),
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# I expected this again:
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(1, 'return', f_ident),
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])
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def test_exception_in_except_clause(self):
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def f(p):
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1/0
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def g(p):
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try:
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f(p)
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except:
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try: f(p)
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except: pass
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f_ident = ident(f)
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g_ident = ident(g)
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self.check_events(g, [(1, 'call', g_ident),
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(3, 'call', f_ident),
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(3, 'return', f_ident),
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(1, 'return', g_ident),
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])
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def test_exception_propogation(self):
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def f(p):
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1/0
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def g(p):
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try: f(p)
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finally: p.add_event("falling through")
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f_ident = ident(f)
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g_ident = ident(g)
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self.check_events(g, [(1, 'call', g_ident),
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(1, 'falling through', g_ident),
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(1, 'return', g_ident),
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])
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def test_raise_twice(self):
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def f(p):
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try: 1/0
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except: 1/0
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_raise_reraise(self):
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def f(p):
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try: 1/0
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except: raise
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_raise(self):
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def f(p):
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raise Exception()
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_distant_exception(self):
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def f():
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1/0
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def g():
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f()
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def h():
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g()
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def i():
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h()
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def j(p):
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i()
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f_ident = ident(f)
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g_ident = ident(g)
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h_ident = ident(h)
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i_ident = ident(i)
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j_ident = ident(j)
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self.check_events(j, [(1, 'call', j_ident),
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(2, 'call', i_ident),
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(3, 'call', h_ident),
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(4, 'call', g_ident),
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(5, 'call', f_ident),
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(5, 'return', f_ident),
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(4, 'return', g_ident),
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(3, 'return', h_ident),
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(2, 'return', i_ident),
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(1, 'return', j_ident),
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])
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def test_generator(self):
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def f():
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for i in range(2):
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yield i
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def g(p):
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for i in f():
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pass
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f_ident = ident(f)
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g_ident = ident(g)
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self.check_events(g, [(1, 'call', g_ident),
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# call the iterator twice to generate values
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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# once more; returns end-of-iteration with
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# actually raising an exception
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(1, 'return', g_ident),
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])
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def test_stop_iteration(self):
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def f():
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for i in range(2):
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yield i
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raise StopIteration
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def g(p):
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for i in f():
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pass
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f_ident = ident(f)
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g_ident = ident(g)
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self.check_events(g, [(1, 'call', g_ident),
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# call the iterator twice to generate values
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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# once more to hit the raise:
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(2, 'call', f_ident),
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(2, 'return', f_ident),
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(1, 'return', g_ident),
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])
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class ProfileSimulatorTestCase(TestCaseBase):
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def new_watcher(self):
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return ProfileSimulator(self)
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def test_simple(self):
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def f(p):
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pass
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_basic_exception(self):
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def f(p):
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1/0
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_caught_exception(self):
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def f(p):
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try: 1/0
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except: pass
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f_ident = ident(f)
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self.check_events(f, [(1, 'call', f_ident),
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(1, 'return', f_ident),
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])
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def test_distant_exception(self):
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def f():
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1/0
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def g():
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f()
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def h():
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g()
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def i():
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h()
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def j(p):
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i()
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f_ident = ident(f)
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g_ident = ident(g)
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h_ident = ident(h)
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i_ident = ident(i)
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j_ident = ident(j)
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self.check_events(j, [(1, 'call', j_ident),
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(2, 'call', i_ident),
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(3, 'call', h_ident),
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(4, 'call', g_ident),
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(5, 'call', f_ident),
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(5, 'return', f_ident),
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(4, 'return', g_ident),
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(3, 'return', h_ident),
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(2, 'return', i_ident),
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(1, 'return', j_ident),
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])
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def ident(function):
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if hasattr(function, "f_code"):
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code = function.f_code
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else:
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code = function.func_code
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return code.co_firstlineno, code.co_name
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def protect(f, p):
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try: f(p)
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except: pass
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protect_ident = ident(protect)
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def capture_events(callable, p=None):
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if p is None:
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p = HookWatcher()
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sys.setprofile(p.callback)
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protect(callable, p)
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sys.setprofile(None)
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return p.get_events()[1:-1]
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def show_events(callable):
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import pprint
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pprint.pprint(capture_events(callable))
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def test_main():
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loader = unittest.TestLoader()
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suite = unittest.TestSuite()
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suite.addTest(loader.loadTestsFromTestCase(ProfileHookTestCase))
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suite.addTest(loader.loadTestsFromTestCase(ProfileSimulatorTestCase))
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test_support.run_suite(suite)
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if __name__ == "__main__":
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test_main()
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