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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 test_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 test_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)
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jump_in_nested_finally.output = [2, 9]
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# The second set of 'jump' tests are for things that are not allowed:
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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()
|