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2996 lines (2610 loc) · 81.4 KB
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# Testing the line trace facility.
from test import support
import unittest
import sys
import difflib
import gc
from functools import wraps
import asyncio
from test.support import import_helper
support.requires_working_socket(module=True)
class tracecontext:
"""Context manager that traces its enter and exit."""
def __init__(self, output, value):
self.output = output
self.value = value
def __enter__(self):
self.output.append(self.value)
def __exit__(self, *exc_info):
self.output.append(-self.value)
class asynctracecontext:
"""Asynchronous context manager that traces its aenter and aexit."""
def __init__(self, output, value):
self.output = output
self.value = value
async def __aenter__(self):
self.output.append(self.value)
async def __aexit__(self, *exc_info):
self.output.append(-self.value)
async def asynciter(iterable):
"""Convert an iterable to an asynchronous iterator."""
for x in iterable:
yield x
# A very basic example. If this fails, we're in deep trouble.
def basic():
return 1
basic.events = [(0, 'call'),
(1, 'line'),
(1, 'return')]
# Many of the tests below are tricky because they involve pass statements.
# If there is implicit control flow around a pass statement (in an except
# clause or else clause) under what conditions do you set a line number
# following that clause?
# Some constructs like "while 0:", "if 0:" or "if 1:...else:..." could be optimized
# away. Make sure that those lines aren't skipped.
def arigo_example0():
x = 1
del x
while 0:
pass
x = 1
arigo_example0.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(5, 'line'),
(5, 'return')]
def arigo_example1():
x = 1
del x
if 0:
pass
x = 1
arigo_example1.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(5, 'line'),
(5, 'return')]
def arigo_example2():
x = 1
del x
if 1:
x = 1
else:
pass
return None
arigo_example2.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(7, 'line'),
(7, 'return')]
# check that lines consisting of just one instruction get traced:
def one_instr_line():
x = 1
del x
x = 1
one_instr_line.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(3, 'return')]
def no_pop_tops(): # 0
x = 1 # 1
for a in range(2): # 2
if a: # 3
x = 1 # 4
else: # 5
x = 1 # 6
no_pop_tops.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(6, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(2, 'line'),
(2, 'return')]
def no_pop_blocks():
y = 1
while not y:
bla
x = 1
no_pop_blocks.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(4, 'line'),
(4, 'return')]
def called(): # line -3
x = 1
def call(): # line 0
called()
call.events = [(0, 'call'),
(1, 'line'),
(-3, 'call'),
(-2, 'line'),
(-2, 'return'),
(1, 'return')]
def raises():
raise Exception
def test_raise():
try:
raises()
except Exception:
pass
test_raise.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(-3, 'call'),
(-2, 'line'),
(-2, 'exception'),
(-2, 'return'),
(2, 'exception'),
(3, 'line'),
(4, 'line'),
(4, 'return')]
def _settrace_and_return(tracefunc):
sys.settrace(tracefunc)
sys._getframe().f_back.f_trace = tracefunc
def settrace_and_return(tracefunc):
_settrace_and_return(tracefunc)
settrace_and_return.events = [(1, 'return')]
def _settrace_and_raise(tracefunc):
sys.settrace(tracefunc)
sys._getframe().f_back.f_trace = tracefunc
raise RuntimeError
def settrace_and_raise(tracefunc):
try:
_settrace_and_raise(tracefunc)
except RuntimeError:
pass
settrace_and_raise.events = [(2, 'exception'),
(3, 'line'),
(4, 'line'),
(4, 'return')]
# implicit return example
# This test is interesting because of the else: pass
# part of the code. The code generate for the true
# part of the if contains a jump past the else branch.
# The compiler then generates an implicit "return None"
# Internally, the compiler visits the pass statement
# and stores its line number for use on the next instruction.
# The next instruction is the implicit return None.
def ireturn_example():
a = 5
b = 5
if a == b:
b = a+1
else:
pass
ireturn_example.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(4, 'return')]
# Tight loop with while(1) example (SF #765624)
def tightloop_example():
items = range(0, 3)
try:
i = 0
while 1:
b = items[i]; i+=1
except IndexError:
pass
tightloop_example.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(4, 'line'),
(5, 'line'),
(4, 'line'),
(5, 'line'),
(4, 'line'),
(5, 'line'),
(5, 'exception'),
(6, 'line'),
(7, 'line'),
(7, 'return')]
def tighterloop_example():
items = range(1, 4)
try:
i = 0
while 1: i = items[i]
except IndexError:
pass
tighterloop_example.events = [(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(4, 'line'),
(4, 'line'),
(4, 'line'),
(4, 'exception'),
(5, 'line'),
(6, 'line'),
(6, 'return')]
def generator_function():
try:
yield True
"continued"
finally:
"finally"
def generator_example():
# any() will leave the generator before its end
x = any(generator_function())
# the following lines were not traced
for x in range(10):
y = x
generator_example.events = ([(0, 'call'),
(2, 'line'),
(-6, 'call'),
(-5, 'line'),
(-4, 'line'),
(-4, 'return'),
(-4, 'call'),
(-4, 'exception'),
(-1, 'line'),
(-1, 'return')] +
[(5, 'line'), (6, 'line')] * 10 +
[(5, 'line'), (5, 'return')])
class Tracer:
def __init__(self, trace_line_events=None, trace_opcode_events=None):
self.trace_line_events = trace_line_events
self.trace_opcode_events = trace_opcode_events
self.events = []
def _reconfigure_frame(self, frame):
if self.trace_line_events is not None:
frame.f_trace_lines = self.trace_line_events
if self.trace_opcode_events is not None:
frame.f_trace_opcodes = self.trace_opcode_events
def trace(self, frame, event, arg):
self._reconfigure_frame(frame)
self.events.append((frame.f_lineno, event))
return self.trace
def traceWithGenexp(self, frame, event, arg):
self._reconfigure_frame(frame)
(o for o in [1])
self.events.append((frame.f_lineno, event))
return self.trace
class TraceTestCase(unittest.TestCase):
# Disable gc collection when tracing, otherwise the
# deallocators may be traced as well.
def setUp(self):
self.using_gc = gc.isenabled()
gc.disable()
self.addCleanup(sys.settrace, sys.gettrace())
def tearDown(self):
if self.using_gc:
gc.enable()
@staticmethod
def make_tracer():
"""Helper to allow test subclasses to configure tracers differently"""
return Tracer()
def compare_events(self, line_offset, events, expected_events):
events = [(l - line_offset if l is not None else None, e) for (l, e) in events]
if events != expected_events:
self.fail(
"events did not match expectation:\n" +
"\n".join(difflib.ndiff([str(x) for x in expected_events],
[str(x) for x in events])))
def run_and_compare(self, func, events):
tracer = self.make_tracer()
sys.settrace(tracer.trace)
func()
sys.settrace(None)
self.compare_events(func.__code__.co_firstlineno,
tracer.events, events)
def run_test(self, func):
self.run_and_compare(func, func.events)
def run_test2(self, func):
tracer = self.make_tracer()
func(tracer.trace)
sys.settrace(None)
self.compare_events(func.__code__.co_firstlineno,
tracer.events, func.events)
def test_set_and_retrieve_none(self):
sys.settrace(None)
assert sys.gettrace() is None
def test_set_and_retrieve_func(self):
def fn(*args):
pass
sys.settrace(fn)
try:
assert sys.gettrace() is fn
finally:
sys.settrace(None)
def test_01_basic(self):
self.run_test(basic)
def test_02_arigo0(self):
self.run_test(arigo_example0)
def test_02_arigo1(self):
self.run_test(arigo_example1)
def test_02_arigo2(self):
self.run_test(arigo_example2)
def test_03_one_instr(self):
self.run_test(one_instr_line)
def test_04_no_pop_blocks(self):
self.run_test(no_pop_blocks)
def test_05_no_pop_tops(self):
self.run_test(no_pop_tops)
def test_06_call(self):
self.run_test(call)
def test_07_raise(self):
self.run_test(test_raise)
def test_08_settrace_and_return(self):
self.run_test2(settrace_and_return)
def test_09_settrace_and_raise(self):
self.run_test2(settrace_and_raise)
def test_10_ireturn(self):
self.run_test(ireturn_example)
def test_11_tightloop(self):
self.run_test(tightloop_example)
def test_12_tighterloop(self):
self.run_test(tighterloop_example)
def test_13_genexp(self):
self.run_test(generator_example)
# issue1265: if the trace function contains a generator,
# and if the traced function contains another generator
# that is not completely exhausted, the trace stopped.
# Worse: the 'finally' clause was not invoked.
tracer = self.make_tracer()
sys.settrace(tracer.traceWithGenexp)
generator_example()
sys.settrace(None)
self.compare_events(generator_example.__code__.co_firstlineno,
tracer.events, generator_example.events)
def test_14_onliner_if(self):
def onliners():
if True: x=False
else: x=True
return 0
self.run_and_compare(
onliners,
[(0, 'call'),
(1, 'line'),
(3, 'line'),
(3, 'return')])
def test_15_loops(self):
# issue1750076: "while" expression is skipped by debugger
def for_example():
for x in range(2):
pass
self.run_and_compare(
for_example,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(1, 'line'),
(2, 'line'),
(1, 'line'),
(1, 'return')])
def while_example():
# While expression should be traced on every loop
x = 2
while x > 0:
x -= 1
self.run_and_compare(
while_example,
[(0, 'call'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(3, 'line'),
(4, 'line'),
(3, 'line'),
(3, 'return')])
def test_16_blank_lines(self):
namespace = {}
exec("def f():\n" + "\n" * 256 + " pass", namespace)
self.run_and_compare(
namespace["f"],
[(0, 'call'),
(257, 'line'),
(257, 'return')])
def test_17_none_f_trace(self):
# Issue 20041: fix TypeError when f_trace is set to None.
def func():
sys._getframe().f_trace = None
lineno = 2
self.run_and_compare(func,
[(0, 'call'),
(1, 'line')])
def test_18_except_with_name(self):
def func():
try:
try:
raise Exception
except Exception as e:
raise
x = "Something"
y = "Something"
except Exception:
pass
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(3, 'exception'),
(4, 'line'),
(5, 'line'),
(8, 'line'),
(9, 'line'),
(9, 'return')])
def test_19_except_with_finally(self):
def func():
try:
try:
raise Exception
finally:
y = "Something"
except Exception:
b = 23
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(3, 'exception'),
(5, 'line'),
(6, 'line'),
(7, 'line'),
(7, 'return')])
def test_20_async_for_loop(self):
class AsyncIteratorWrapper:
def __init__(self, obj):
self._it = iter(obj)
def __aiter__(self):
return self
async def __anext__(self):
try:
return next(self._it)
except StopIteration:
raise StopAsyncIteration
async def doit_async():
async for letter in AsyncIteratorWrapper("abc"):
x = letter
y = 42
def run(tracer):
x = doit_async()
try:
sys.settrace(tracer)
x.send(None)
finally:
sys.settrace(None)
tracer = self.make_tracer()
events = [
(0, 'call'),
(1, 'line'),
(-12, 'call'),
(-11, 'line'),
(-11, 'return'),
(-9, 'call'),
(-8, 'line'),
(-8, 'return'),
(-6, 'call'),
(-5, 'line'),
(-4, 'line'),
(-4, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-6, 'call'),
(-5, 'line'),
(-4, 'line'),
(-4, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-6, 'call'),
(-5, 'line'),
(-4, 'line'),
(-4, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-6, 'call'),
(-5, 'line'),
(-4, 'line'),
(-4, 'exception'),
(-3, 'line'),
(-2, 'line'),
(-2, 'exception'),
(-2, 'return'),
(1, 'exception'),
(3, 'line'),
(3, 'return')]
try:
run(tracer.trace)
except Exception:
pass
self.compare_events(doit_async.__code__.co_firstlineno,
tracer.events, events)
def test_async_for_backwards_jump_has_no_line(self):
async def arange(n):
for i in range(n):
yield i
async def f():
async for i in arange(3):
if i > 100:
break # should never be traced
tracer = self.make_tracer()
coro = f()
try:
sys.settrace(tracer.trace)
coro.send(None)
except Exception:
pass
finally:
sys.settrace(None)
events = [
(0, 'call'),
(1, 'line'),
(-3, 'call'),
(-2, 'line'),
(-1, 'line'),
(-1, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-1, 'call'),
(-2, 'line'),
(-1, 'line'),
(-1, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-1, 'call'),
(-2, 'line'),
(-1, 'line'),
(-1, 'return'),
(1, 'exception'),
(2, 'line'),
(1, 'line'),
(-1, 'call'),
(-2, 'line'),
(-2, 'return'),
(1, 'exception'),
(1, 'return'),
]
self.compare_events(f.__code__.co_firstlineno,
tracer.events, events)
def test_21_repeated_pass(self):
def func():
pass
pass
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(2, 'return')])
def test_loop_in_try_except(self):
# https://bugs.python.org/issue41670
def func():
try:
for i in []: pass
return 1
except:
return 2
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(3, 'return')])
def test_try_except_no_exception(self):
def func():
try:
2
except:
4
else:
6
if False:
8
else:
10
if func.__name__ == 'Fred':
12
finally:
14
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(6, 'line'),
(7, 'line'),
(10, 'line'),
(11, 'line'),
(14, 'line'),
(14, 'return')])
def test_try_exception_in_else(self):
def func():
try:
try:
3
except:
5
else:
7
raise Exception
finally:
10
except:
12
finally:
14
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(7, 'line'),
(8, 'line'),
(8, 'exception'),
(10, 'line'),
(11, 'line'),
(12, 'line'),
(14, 'line'),
(14, 'return')])
def test_nested_loops(self):
def func():
for i in range(2):
for j in range(2):
a = i + j
return a == 1
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(2, 'line'),
(3, 'line'),
(2, 'line'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(2, 'line'),
(3, 'line'),
(2, 'line'),
(1, 'line'),
(4, 'line'),
(4, 'return')])
def test_if_break(self):
def func():
seq = [1, 0]
while seq:
n = seq.pop()
if n:
break # line 5
else:
n = 99
return n # line 8
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(8, 'line'),
(8, 'return')])
def test_break_through_finally(self):
def func():
a, c, d, i = 1, 1, 1, 99
try:
for i in range(3):
try:
a = 5
if i > 0:
break # line 7
a = 8
finally:
c = 10
except:
d = 12 # line 12
assert a == 5 and c == 10 and d == 1 # line 13
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(8, 'line'),
(10, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(7, 'line'),
(10, 'line')] +
([(13, 'line'), (13, 'return')] if __debug__ else [(10, 'return')]))
def test_continue_through_finally(self):
def func():
a, b, c, d, i = 1, 1, 1, 1, 99
try:
for i in range(2):
try:
a = 5
if i > 0:
continue # line 7
b = 8
finally:
c = 10
except:
d = 12 # line 12
assert (a, b, c, d) == (5, 8, 10, 1) # line 13
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(8, 'line'),
(10, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(7, 'line'),
(10, 'line'),
(3, 'line')] +
([(13, 'line'), (13, 'return')] if __debug__ else [(3, 'return')]))
def test_return_through_finally(self):
def func():
try:
return 2
finally:
4
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(4, 'line'),
(4, 'return')])
def test_try_except_with_wrong_type(self):
def func():
try:
2/0
except IndexError:
4
finally:
return 6
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(2, 'exception'),
(3, 'line'),
(6, 'line'),
(6, 'return')])
def test_break_to_continue1(self):
def func():
TRUE = 1
x = [1]
while x:
x.pop()
while TRUE:
break
continue
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(7, 'line'),
(3, 'line'),
(3, 'return')])
def test_break_to_continue2(self):
def func():
TRUE = 1
x = [1]
while x:
x.pop()
while TRUE:
break
else:
continue
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(6, 'line'),
(3, 'line'),
(3, 'return')])
def test_break_to_break(self):
def func():
TRUE = 1
while TRUE:
while TRUE:
break
break
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(5, 'line'),
(5, 'return')])
def test_nested_ifs(self):
def func():
a = b = 1
if a == 1:
if b == 1:
x = 4
else:
y = 6
else:
z = 8
self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(4, 'line'),
(4, 'return')])
def test_nested_ifs_with_and(self):
def func():
if A:
if B:
if C:
if D:
return False