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31f5929c1e
Many tests simply didn't care if they unset a pre-existing trace function. This made test coverage impossible. This patch fixes various tests to put back any pre-existing trace function. It also introduces test.support.no_tracing as a decorator which will temporarily unset the trace function for tests which simply fail otherwise. Thanks to Kristian Vlaardingerbroek for helping to find the cause of various trace function unsets.
800 lines
24 KiB
Python
800 lines
24 KiB
Python
# Testing the line trace facility.
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from test import support
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import unittest
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import sys
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import difflib
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import gc
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# A very basic example. If this fails, we're in deep trouble.
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def basic():
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return 1
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basic.events = [(0, 'call'),
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(1, 'line'),
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(1, 'return')]
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# Many of the tests below are tricky because they involve pass statements.
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# If there is implicit control flow around a pass statement (in an except
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# clause or else caluse) under what conditions do you set a line number
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# following that clause?
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# The entire "while 0:" statement is optimized away. No code
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# exists for it, so the line numbers skip directly from "del x"
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# to "x = 1".
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def arigo_example():
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x = 1
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del x
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while 0:
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pass
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x = 1
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arigo_example.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(5, 'line'),
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(5, 'return')]
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# check that lines consisting of just one instruction get traced:
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def one_instr_line():
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x = 1
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del x
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x = 1
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one_instr_line.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(3, 'line'),
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(3, 'return')]
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def no_pop_tops(): # 0
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x = 1 # 1
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for a in range(2): # 2
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if a: # 3
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x = 1 # 4
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else: # 5
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x = 1 # 6
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no_pop_tops.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(3, 'line'),
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(6, 'line'),
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(2, 'line'),
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(3, 'line'),
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(4, 'line'),
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(2, 'line'),
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(2, 'return')]
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def no_pop_blocks():
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y = 1
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while not y:
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bla
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x = 1
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no_pop_blocks.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(4, 'line'),
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(4, 'return')]
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def called(): # line -3
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x = 1
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def call(): # line 0
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called()
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call.events = [(0, 'call'),
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(1, 'line'),
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(-3, 'call'),
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(-2, 'line'),
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(-2, 'return'),
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(1, 'return')]
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def raises():
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raise Exception
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def test_raise():
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try:
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raises()
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except Exception as exc:
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x = 1
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test_raise.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(-3, 'call'),
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(-2, 'line'),
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(-2, 'exception'),
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(-2, 'return'),
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(2, 'exception'),
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(3, 'line'),
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(4, 'line'),
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(4, 'return')]
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def _settrace_and_return(tracefunc):
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sys.settrace(tracefunc)
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sys._getframe().f_back.f_trace = tracefunc
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def settrace_and_return(tracefunc):
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_settrace_and_return(tracefunc)
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settrace_and_return.events = [(1, 'return')]
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def _settrace_and_raise(tracefunc):
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sys.settrace(tracefunc)
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sys._getframe().f_back.f_trace = tracefunc
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raise RuntimeError
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def settrace_and_raise(tracefunc):
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try:
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_settrace_and_raise(tracefunc)
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except RuntimeError as exc:
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pass
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settrace_and_raise.events = [(2, 'exception'),
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(3, 'line'),
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(4, 'line'),
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(4, 'return')]
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# implicit return example
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# This test is interesting because of the else: pass
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# part of the code. The code generate for the true
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# part of the if contains a jump past the else branch.
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# The compiler then generates an implicit "return None"
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# Internally, the compiler visits the pass statement
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# and stores its line number for use on the next instruction.
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# The next instruction is the implicit return None.
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def ireturn_example():
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a = 5
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b = 5
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if a == b:
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b = a+1
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else:
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pass
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ireturn_example.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(3, 'line'),
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(4, 'line'),
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(6, 'line'),
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(6, 'return')]
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# Tight loop with while(1) example (SF #765624)
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def tightloop_example():
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items = range(0, 3)
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try:
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i = 0
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while 1:
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b = items[i]; i+=1
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except IndexError:
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pass
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tightloop_example.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(3, 'line'),
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(4, 'line'),
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(5, 'line'),
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(5, 'line'),
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(5, 'line'),
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(5, 'line'),
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(5, 'exception'),
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(6, 'line'),
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(7, 'line'),
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(7, 'return')]
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def tighterloop_example():
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items = range(1, 4)
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try:
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i = 0
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while 1: i = items[i]
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except IndexError:
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pass
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tighterloop_example.events = [(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(3, 'line'),
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(4, 'line'),
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(4, 'line'),
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(4, 'line'),
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(4, 'line'),
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(4, 'exception'),
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(5, 'line'),
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(6, 'line'),
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(6, 'return')]
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def generator_function():
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try:
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yield True
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"continued"
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finally:
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"finally"
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def generator_example():
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# any() will leave the generator before its end
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x = any(generator_function())
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# the following lines were not traced
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for x in range(10):
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y = x
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generator_example.events = ([(0, 'call'),
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(2, 'line'),
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(-6, 'call'),
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(-5, 'line'),
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(-4, 'line'),
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(-4, 'return'),
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(-4, 'call'),
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(-4, 'exception'),
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(-1, 'line'),
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(-1, 'return')] +
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[(5, 'line'), (6, 'line')] * 10 +
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[(5, 'line'), (5, 'return')])
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class Tracer:
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def __init__(self):
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self.events = []
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def trace(self, frame, event, arg):
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self.events.append((frame.f_lineno, event))
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return self.trace
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def traceWithGenexp(self, frame, event, arg):
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(o for o in [1])
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self.events.append((frame.f_lineno, event))
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return self.trace
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class TraceTestCase(unittest.TestCase):
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# Disable gc collection when tracing, otherwise the
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# deallocators may be traced as well.
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def setUp(self):
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self.using_gc = gc.isenabled()
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gc.disable()
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self.addCleanup(sys.settrace, sys.gettrace())
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def tearDown(self):
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if self.using_gc:
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gc.enable()
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def compare_events(self, line_offset, events, expected_events):
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events = [(l - line_offset, e) for (l, e) in events]
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if events != expected_events:
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self.fail(
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"events did not match expectation:\n" +
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"\n".join(difflib.ndiff([str(x) for x in expected_events],
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[str(x) for x in events])))
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def run_and_compare(self, func, events):
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tracer = Tracer()
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sys.settrace(tracer.trace)
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func()
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sys.settrace(None)
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self.compare_events(func.__code__.co_firstlineno,
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tracer.events, events)
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def run_test(self, func):
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self.run_and_compare(func, func.events)
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def run_test2(self, func):
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tracer = Tracer()
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func(tracer.trace)
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sys.settrace(None)
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self.compare_events(func.__code__.co_firstlineno,
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tracer.events, func.events)
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def set_and_retrieve_none(self):
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sys.settrace(None)
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assert sys.gettrace() is None
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def set_and_retrieve_func(self):
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def fn(*args):
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pass
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sys.settrace(fn)
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try:
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assert sys.gettrace() is fn
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finally:
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sys.settrace(None)
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def test_01_basic(self):
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self.run_test(basic)
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def test_02_arigo(self):
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self.run_test(arigo_example)
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def test_03_one_instr(self):
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self.run_test(one_instr_line)
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def test_04_no_pop_blocks(self):
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self.run_test(no_pop_blocks)
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def test_05_no_pop_tops(self):
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self.run_test(no_pop_tops)
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def test_06_call(self):
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self.run_test(call)
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def test_07_raise(self):
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self.run_test(test_raise)
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def test_08_settrace_and_return(self):
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self.run_test2(settrace_and_return)
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def test_09_settrace_and_raise(self):
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self.run_test2(settrace_and_raise)
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def test_10_ireturn(self):
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self.run_test(ireturn_example)
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def test_11_tightloop(self):
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self.run_test(tightloop_example)
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def test_12_tighterloop(self):
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self.run_test(tighterloop_example)
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def test_13_genexp(self):
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self.run_test(generator_example)
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# issue1265: if the trace function contains a generator,
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# and if the traced function contains another generator
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# that is not completely exhausted, the trace stopped.
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# Worse: the 'finally' clause was not invoked.
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tracer = Tracer()
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sys.settrace(tracer.traceWithGenexp)
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generator_example()
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sys.settrace(None)
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self.compare_events(generator_example.__code__.co_firstlineno,
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tracer.events, generator_example.events)
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def test_14_onliner_if(self):
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def onliners():
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if True: False
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else: True
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return 0
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self.run_and_compare(
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onliners,
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[(0, 'call'),
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(1, 'line'),
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(3, 'line'),
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(3, 'return')])
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def test_15_loops(self):
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# issue1750076: "while" expression is skipped by debugger
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def for_example():
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for x in range(2):
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pass
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self.run_and_compare(
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for_example,
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[(0, 'call'),
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(1, 'line'),
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(2, 'line'),
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(1, 'line'),
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(2, 'line'),
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(1, 'line'),
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(1, 'return')])
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def while_example():
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# While expression should be traced on every loop
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x = 2
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while x > 0:
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x -= 1
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self.run_and_compare(
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while_example,
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[(0, 'call'),
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(2, 'line'),
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(3, 'line'),
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(4, 'line'),
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(3, 'line'),
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(4, 'line'),
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(3, 'line'),
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(3, 'return')])
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def test_16_blank_lines(self):
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namespace = {}
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exec("def f():\n" + "\n" * 256 + " pass", namespace)
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self.run_and_compare(
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namespace["f"],
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[(0, 'call'),
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(257, 'line'),
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(257, 'return')])
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class RaisingTraceFuncTestCase(unittest.TestCase):
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def setUp(self):
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self.addCleanup(sys.settrace, sys.gettrace())
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def trace(self, frame, event, arg):
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"""A trace function that raises an exception in response to a
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specific trace event."""
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if event == self.raiseOnEvent:
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raise ValueError # just something that isn't RuntimeError
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else:
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return self.trace
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def f(self):
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"""The function to trace; raises an exception if that's the case
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we're testing, so that the 'exception' trace event fires."""
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if self.raiseOnEvent == 'exception':
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x = 0
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y = 1/x
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else:
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return 1
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def run_test_for_event(self, event):
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"""Tests that an exception raised in response to the given event is
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handled OK."""
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self.raiseOnEvent = event
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try:
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for i in range(sys.getrecursionlimit() + 1):
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sys.settrace(self.trace)
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try:
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self.f()
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except ValueError:
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pass
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else:
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self.fail("exception not thrown!")
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except RuntimeError:
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self.fail("recursion counter not reset")
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# Test the handling of exceptions raised by each kind of trace event.
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def test_call(self):
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self.run_test_for_event('call')
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def test_line(self):
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self.run_test_for_event('line')
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def test_return(self):
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self.run_test_for_event('return')
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def test_exception(self):
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self.run_test_for_event('exception')
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def test_trash_stack(self):
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def f():
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for i in range(5):
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print(i) # line tracing will raise an exception at this line
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def g(frame, why, extra):
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if (why == 'line' and
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frame.f_lineno == f.__code__.co_firstlineno + 2):
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raise RuntimeError("i am crashing")
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return g
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sys.settrace(g)
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try:
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f()
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except RuntimeError:
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# the test is really that this doesn't segfault:
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import gc
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gc.collect()
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else:
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self.fail("exception not propagated")
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# 'Jump' tests: assigning to frame.f_lineno within a trace function
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# moves the execution position - it's how debuggers implement a Jump
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# command (aka. "Set next statement").
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class JumpTracer:
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"""Defines a trace function that jumps from one place to another,
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with the source and destination lines of the jump being defined by
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the 'jump' property of the function under test."""
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def __init__(self, function):
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self.function = function
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self.jumpFrom = function.jump[0]
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self.jumpTo = function.jump[1]
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self.done = False
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def trace(self, frame, event, arg):
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if not self.done and frame.f_code == self.function.__code__:
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firstLine = frame.f_code.co_firstlineno
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if event == 'line' and frame.f_lineno == firstLine + self.jumpFrom:
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# Cope with non-integer self.jumpTo (because of
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# no_jump_to_non_integers below).
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try:
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frame.f_lineno = firstLine + self.jumpTo
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except TypeError:
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frame.f_lineno = self.jumpTo
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self.done = True
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return self.trace
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# The first set of 'jump' tests are for things that are allowed:
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def jump_simple_forwards(output):
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output.append(1)
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output.append(2)
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output.append(3)
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jump_simple_forwards.jump = (1, 3)
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jump_simple_forwards.output = [3]
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def jump_simple_backwards(output):
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output.append(1)
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output.append(2)
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jump_simple_backwards.jump = (2, 1)
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jump_simple_backwards.output = [1, 1, 2]
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def jump_out_of_block_forwards(output):
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for i in 1, 2:
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output.append(2)
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for j in [3]: # Also tests jumping over a block
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output.append(4)
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output.append(5)
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jump_out_of_block_forwards.jump = (3, 5)
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jump_out_of_block_forwards.output = [2, 5]
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def jump_out_of_block_backwards(output):
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output.append(1)
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for i in [1]:
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output.append(3)
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for j in [2]: # Also tests jumping over a block
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output.append(5)
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output.append(6)
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output.append(7)
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jump_out_of_block_backwards.jump = (6, 1)
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jump_out_of_block_backwards.output = [1, 3, 5, 1, 3, 5, 6, 7]
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def jump_to_codeless_line(output):
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output.append(1)
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# Jumping to this line should skip to the next one.
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output.append(3)
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jump_to_codeless_line.jump = (1, 2)
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jump_to_codeless_line.output = [3]
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def jump_to_same_line(output):
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output.append(1)
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output.append(2)
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output.append(3)
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jump_to_same_line.jump = (2, 2)
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jump_to_same_line.output = [1, 2, 3]
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# Tests jumping within a finally block, and over one.
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def jump_in_nested_finally(output):
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try:
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output.append(2)
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finally:
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output.append(4)
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try:
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output.append(6)
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finally:
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output.append(8)
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output.append(9)
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|
|
jump_in_nested_finally.jump = (4, 9)
|
|
jump_in_nested_finally.output = [2, 9]
|
|
|
|
# The second set of 'jump' tests are for things that are not allowed:
|
|
|
|
def no_jump_too_far_forwards(output):
|
|
try:
|
|
output.append(2)
|
|
output.append(3)
|
|
except ValueError as e:
|
|
output.append('after' in str(e))
|
|
|
|
no_jump_too_far_forwards.jump = (3, 6)
|
|
no_jump_too_far_forwards.output = [2, True]
|
|
|
|
def no_jump_too_far_backwards(output):
|
|
try:
|
|
output.append(2)
|
|
output.append(3)
|
|
except ValueError as e:
|
|
output.append('before' in str(e))
|
|
|
|
no_jump_too_far_backwards.jump = (3, -1)
|
|
no_jump_too_far_backwards.output = [2, True]
|
|
|
|
# Test each kind of 'except' line.
|
|
def no_jump_to_except_1(output):
|
|
try:
|
|
output.append(2)
|
|
except:
|
|
e = sys.exc_info()[1]
|
|
output.append('except' in str(e))
|
|
|
|
no_jump_to_except_1.jump = (2, 3)
|
|
no_jump_to_except_1.output = [True]
|
|
|
|
def no_jump_to_except_2(output):
|
|
try:
|
|
output.append(2)
|
|
except ValueError:
|
|
e = sys.exc_info()[1]
|
|
output.append('except' in str(e))
|
|
|
|
no_jump_to_except_2.jump = (2, 3)
|
|
no_jump_to_except_2.output = [True]
|
|
|
|
def no_jump_to_except_3(output):
|
|
try:
|
|
output.append(2)
|
|
except ValueError as e:
|
|
output.append('except' in str(e))
|
|
|
|
no_jump_to_except_3.jump = (2, 3)
|
|
no_jump_to_except_3.output = [True]
|
|
|
|
def no_jump_to_except_4(output):
|
|
try:
|
|
output.append(2)
|
|
except (ValueError, RuntimeError) as e:
|
|
output.append('except' in str(e))
|
|
|
|
no_jump_to_except_4.jump = (2, 3)
|
|
no_jump_to_except_4.output = [True]
|
|
|
|
def no_jump_forwards_into_block(output):
|
|
try:
|
|
output.append(2)
|
|
for i in 1, 2:
|
|
output.append(4)
|
|
except ValueError as e:
|
|
output.append('into' in str(e))
|
|
|
|
no_jump_forwards_into_block.jump = (2, 4)
|
|
no_jump_forwards_into_block.output = [True]
|
|
|
|
def no_jump_backwards_into_block(output):
|
|
try:
|
|
for i in 1, 2:
|
|
output.append(3)
|
|
output.append(4)
|
|
except ValueError as e:
|
|
output.append('into' in str(e))
|
|
|
|
no_jump_backwards_into_block.jump = (4, 3)
|
|
no_jump_backwards_into_block.output = [3, 3, True]
|
|
|
|
def no_jump_into_finally_block(output):
|
|
try:
|
|
try:
|
|
output.append(3)
|
|
x = 1
|
|
finally:
|
|
output.append(6)
|
|
except ValueError as e:
|
|
output.append('finally' in str(e))
|
|
|
|
no_jump_into_finally_block.jump = (4, 6)
|
|
no_jump_into_finally_block.output = [3, 6, True] # The 'finally' still runs
|
|
|
|
def no_jump_out_of_finally_block(output):
|
|
try:
|
|
try:
|
|
output.append(3)
|
|
finally:
|
|
output.append(5)
|
|
output.append(6)
|
|
except ValueError as e:
|
|
output.append('finally' in str(e))
|
|
|
|
no_jump_out_of_finally_block.jump = (5, 1)
|
|
no_jump_out_of_finally_block.output = [3, True]
|
|
|
|
# This verifies the line-numbers-must-be-integers rule.
|
|
def no_jump_to_non_integers(output):
|
|
try:
|
|
output.append(2)
|
|
except ValueError as e:
|
|
output.append('integer' in str(e))
|
|
|
|
no_jump_to_non_integers.jump = (2, "Spam")
|
|
no_jump_to_non_integers.output = [True]
|
|
|
|
# This verifies that you can't set f_lineno via _getframe or similar
|
|
# trickery.
|
|
def no_jump_without_trace_function():
|
|
try:
|
|
previous_frame = sys._getframe().f_back
|
|
previous_frame.f_lineno = previous_frame.f_lineno
|
|
except ValueError as e:
|
|
# This is the exception we wanted; make sure the error message
|
|
# talks about trace functions.
|
|
if 'trace' not in str(e):
|
|
raise
|
|
else:
|
|
# Something's wrong - the expected exception wasn't raised.
|
|
raise RuntimeError("Trace-function-less jump failed to fail")
|
|
|
|
|
|
class JumpTestCase(unittest.TestCase):
|
|
def setUp(self):
|
|
self.addCleanup(sys.settrace, sys.gettrace())
|
|
sys.settrace(None)
|
|
|
|
def compare_jump_output(self, expected, received):
|
|
if received != expected:
|
|
self.fail( "Outputs don't match:\n" +
|
|
"Expected: " + repr(expected) + "\n" +
|
|
"Received: " + repr(received))
|
|
|
|
def run_test(self, func):
|
|
tracer = JumpTracer(func)
|
|
sys.settrace(tracer.trace)
|
|
output = []
|
|
func(output)
|
|
sys.settrace(None)
|
|
self.compare_jump_output(func.output, output)
|
|
|
|
def test_01_jump_simple_forwards(self):
|
|
self.run_test(jump_simple_forwards)
|
|
def test_02_jump_simple_backwards(self):
|
|
self.run_test(jump_simple_backwards)
|
|
def test_03_jump_out_of_block_forwards(self):
|
|
self.run_test(jump_out_of_block_forwards)
|
|
def test_04_jump_out_of_block_backwards(self):
|
|
self.run_test(jump_out_of_block_backwards)
|
|
def test_05_jump_to_codeless_line(self):
|
|
self.run_test(jump_to_codeless_line)
|
|
def test_06_jump_to_same_line(self):
|
|
self.run_test(jump_to_same_line)
|
|
def test_07_jump_in_nested_finally(self):
|
|
self.run_test(jump_in_nested_finally)
|
|
def test_08_no_jump_too_far_forwards(self):
|
|
self.run_test(no_jump_too_far_forwards)
|
|
def test_09_no_jump_too_far_backwards(self):
|
|
self.run_test(no_jump_too_far_backwards)
|
|
def test_10_no_jump_to_except_1(self):
|
|
self.run_test(no_jump_to_except_1)
|
|
def test_11_no_jump_to_except_2(self):
|
|
self.run_test(no_jump_to_except_2)
|
|
def test_12_no_jump_to_except_3(self):
|
|
self.run_test(no_jump_to_except_3)
|
|
def test_13_no_jump_to_except_4(self):
|
|
self.run_test(no_jump_to_except_4)
|
|
def test_14_no_jump_forwards_into_block(self):
|
|
self.run_test(no_jump_forwards_into_block)
|
|
def test_15_no_jump_backwards_into_block(self):
|
|
self.run_test(no_jump_backwards_into_block)
|
|
def test_16_no_jump_into_finally_block(self):
|
|
self.run_test(no_jump_into_finally_block)
|
|
def test_17_no_jump_out_of_finally_block(self):
|
|
self.run_test(no_jump_out_of_finally_block)
|
|
def test_18_no_jump_to_non_integers(self):
|
|
self.run_test(no_jump_to_non_integers)
|
|
def test_19_no_jump_without_trace_function(self):
|
|
# Must set sys.settrace(None) in setUp(), else condition is not
|
|
# triggered.
|
|
no_jump_without_trace_function()
|
|
|
|
def test_20_large_function(self):
|
|
d = {}
|
|
exec("""def f(output): # line 0
|
|
x = 0 # line 1
|
|
y = 1 # line 2
|
|
''' # line 3
|
|
%s # lines 4-1004
|
|
''' # line 1005
|
|
x += 1 # line 1006
|
|
output.append(x) # line 1007
|
|
return""" % ('\n' * 1000,), d)
|
|
f = d['f']
|
|
|
|
f.jump = (2, 1007)
|
|
f.output = [0]
|
|
self.run_test(f)
|
|
|
|
def test_jump_to_firstlineno(self):
|
|
# This tests that PDB can jump back to the first line in a
|
|
# file. See issue #1689458. It can only be triggered in a
|
|
# function call if the function is defined on a single line.
|
|
code = compile("""
|
|
# Comments don't count.
|
|
output.append(2) # firstlineno is here.
|
|
output.append(3)
|
|
output.append(4)
|
|
""", "<fake module>", "exec")
|
|
class fake_function:
|
|
__code__ = code
|
|
jump = (2, 0)
|
|
tracer = JumpTracer(fake_function)
|
|
sys.settrace(tracer.trace)
|
|
namespace = {"output": []}
|
|
exec(code, namespace)
|
|
sys.settrace(None)
|
|
self.compare_jump_output([2, 3, 2, 3, 4], namespace["output"])
|
|
|
|
|
|
def test_main():
|
|
support.run_unittest(
|
|
TraceTestCase,
|
|
RaisingTraceFuncTestCase,
|
|
JumpTestCase
|
|
)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|