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Text File  |  2005-11-19  |  16KB  |  542 lines
  1. # Testing the line trace facility.
  2.  
  3. from test import test_support
  4. import unittest
  5. import sys
  6. import difflib
  7.  
  8. # A very basic example.  If this fails, we're in deep trouble.
  9. def basic():
  10.     return 1
  11.  
  12. basic.events = [(0, 'call'),
  13.                 (1, 'line'),
  14.                 (1, 'return')]
  15.  
  16. # Armin Rigo's failing example:
  17. def arigo_example():
  18.     x = 1
  19.     del x
  20.     while 0:
  21.         pass
  22.     x = 1
  23.  
  24. arigo_example.events = [(0, 'call'),
  25.                         (1, 'line'),
  26.                         (2, 'line'),
  27.                         (3, 'line'),
  28.                         (5, 'line'),
  29.                         (5, 'return')]
  30.  
  31. # check that lines consisting of just one instruction get traced:
  32. def one_instr_line():
  33.     x = 1
  34.     del x
  35.     x = 1
  36.  
  37. one_instr_line.events = [(0, 'call'),
  38.                          (1, 'line'),
  39.                          (2, 'line'),
  40.                          (3, 'line'),
  41.                          (3, 'return')]
  42.  
  43. def no_pop_tops():      # 0
  44.     x = 1               # 1
  45.     for a in range(2):  # 2
  46.         if a:           # 3
  47.             x = 1       # 4
  48.         else:           # 5
  49.             x = 1       # 6
  50.  
  51. no_pop_tops.events = [(0, 'call'),
  52.                       (1, 'line'),
  53.                       (2, 'line'),
  54.                       (3, 'line'),
  55.                       (6, 'line'),
  56.                       (2, 'line'),
  57.                       (3, 'line'),
  58.                       (4, 'line'),
  59.                       (2, 'line'),
  60.                       (2, 'return')]
  61.  
  62. def no_pop_blocks():
  63.     while 0:
  64.         bla
  65.     x = 1
  66.  
  67. no_pop_blocks.events = [(0, 'call'),
  68.                         (1, 'line'),
  69.                         (3, 'line'),
  70.                         (3, 'return')]
  71.  
  72. def called(): # line -3
  73.     x = 1
  74.  
  75. def call():   # line 0
  76.     called()
  77.  
  78. call.events = [(0, 'call'),
  79.                (1, 'line'),
  80.                (-3, 'call'),
  81.                (-2, 'line'),
  82.                (-2, 'return'),
  83.                (1, 'return')]
  84.  
  85. def raises():
  86.     raise Exception
  87.  
  88. def test_raise():
  89.     try:
  90.         raises()
  91.     except Exception, exc:
  92.         x = 1
  93.  
  94. test_raise.events = [(0, 'call'),
  95.                      (1, 'line'),
  96.                      (2, 'line'),
  97.                      (-3, 'call'),
  98.                      (-2, 'line'),
  99.                      (-2, 'exception'),
  100.                      (2, 'exception'),
  101.                      (3, 'line'),
  102.                      (4, 'line'),
  103.                      (4, 'return')]
  104.  
  105. def _settrace_and_return(tracefunc):
  106.     sys.settrace(tracefunc)
  107.     sys._getframe().f_back.f_trace = tracefunc
  108. def settrace_and_return(tracefunc):
  109.     _settrace_and_return(tracefunc)
  110.  
  111. settrace_and_return.events = [(1, 'return')]
  112.  
  113. def _settrace_and_raise(tracefunc):
  114.     sys.settrace(tracefunc)
  115.     sys._getframe().f_back.f_trace = tracefunc
  116.     raise RuntimeError
  117. def settrace_and_raise(tracefunc):
  118.     try:
  119.         _settrace_and_raise(tracefunc)
  120.     except RuntimeError, exc:
  121.         pass
  122.  
  123. settrace_and_raise.events = [(2, 'exception'),
  124.                              (3, 'line'),
  125.                              (4, 'line'),
  126.                              (4, 'return')]
  127.  
  128. class Tracer:
  129.     def __init__(self):
  130.         self.events = []
  131.     def trace(self, frame, event, arg):
  132.         self.events.append((frame.f_lineno, event))
  133.         return self.trace
  134.  
  135. class TraceTestCase(unittest.TestCase):
  136.     def compare_events(self, line_offset, events, expected_events):
  137.         events = [(l - line_offset, e) for (l, e) in events]
  138.         if events != expected_events:
  139.             self.fail(
  140.                 "events did not match expectation:\n" +
  141.                 "\n".join(difflib.ndiff(map(str, expected_events),
  142.                                         map(str, events))))
  143.  
  144.  
  145.     def run_test(self, func):
  146.         tracer = Tracer()
  147.         sys.settrace(tracer.trace)
  148.         func()
  149.         sys.settrace(None)
  150.         self.compare_events(func.func_code.co_firstlineno,
  151.                             tracer.events, func.events)
  152.  
  153.     def run_test2(self, func):
  154.         tracer = Tracer()
  155.         func(tracer.trace)
  156.         sys.settrace(None)
  157.         self.compare_events(func.func_code.co_firstlineno,
  158.                             tracer.events, func.events)
  159.  
  160.     def test_1_basic(self):
  161.         self.run_test(basic)
  162.     def test_2_arigo(self):
  163.         self.run_test(arigo_example)
  164.     def test_3_one_instr(self):
  165.         self.run_test(one_instr_line)
  166.     def test_4_no_pop_blocks(self):
  167.         self.run_test(no_pop_blocks)
  168.     def test_5_no_pop_tops(self):
  169.         self.run_test(no_pop_tops)
  170.     def test_6_call(self):
  171.         self.run_test(call)
  172.     def test_7_raise(self):
  173.         self.run_test(test_raise)
  174.  
  175.     def test_8_settrace_and_return(self):
  176.         self.run_test2(settrace_and_return)
  177.     def test_9_settrace_and_raise(self):
  178.         self.run_test2(settrace_and_raise)
  179.  
  180. class RaisingTraceFuncTestCase(unittest.TestCase):
  181.     def trace(self, frame, event, arg):
  182.         """A trace function that raises an exception in response to a
  183.         specific trace event."""
  184.         if event == self.raiseOnEvent:
  185.             raise ValueError # just something that isn't RuntimeError
  186.         else:
  187.             return self.trace
  188.  
  189.     def f(self):
  190.         """The function to trace; raises an exception if that's the case
  191.         we're testing, so that the 'exception' trace event fires."""
  192.         if self.raiseOnEvent == 'exception':
  193.             x = 0
  194.             y = 1/x
  195.         else:
  196.             return 1
  197.  
  198.     def run_test_for_event(self, event):
  199.         """Tests that an exception raised in response to the given event is
  200.         handled OK."""
  201.         self.raiseOnEvent = event
  202.         try:
  203.             for i in xrange(sys.getrecursionlimit() + 1):
  204.                 sys.settrace(self.trace)
  205.                 try:
  206.                     self.f()
  207.                 except ValueError:
  208.                     pass
  209.                 else:
  210.                     self.fail("exception not thrown!")
  211.         except RuntimeError:
  212.             self.fail("recursion counter not reset")
  213.  
  214.     # Test the handling of exceptions raised by each kind of trace event.
  215.     def test_call(self):
  216.         self.run_test_for_event('call')
  217.     def test_line(self):
  218.         self.run_test_for_event('line')
  219.     def test_return(self):
  220.         self.run_test_for_event('return')
  221.     def test_exception(self):
  222.         self.run_test_for_event('exception')
  223.  
  224.     def test_trash_stack(self):
  225.         def f():
  226.             for i in range(5):
  227.                 print i  # line tracing will raise an exception at this line
  228.  
  229.         def g(frame, why, extra):
  230.             if (why == 'line' and
  231.                 frame.f_lineno == f.func_code.co_firstlineno + 2):
  232.                 raise RuntimeError, "i am crashing"
  233.             return g
  234.  
  235.         sys.settrace(g)
  236.         try:
  237.             f()
  238.         except RuntimeError:
  239.             # the test is really that this doesn't segfault:
  240.             import gc
  241.             gc.collect()
  242.         else:
  243.             self.fail("exception not propagated")
  244.  
  245.  
  246. # 'Jump' tests: assigning to frame.f_lineno within a trace function
  247. # moves the execution position - it's how debuggers implement a Jump
  248. # command (aka. "Set next statement").
  249.  
  250. class JumpTracer:
  251.     """Defines a trace function that jumps from one place to another,
  252.     with the source and destination lines of the jump being defined by
  253.     the 'jump' property of the function under test."""
  254.  
  255.     def __init__(self, function):
  256.         self.function = function
  257.         self.jumpFrom = function.jump[0]
  258.         self.jumpTo = function.jump[1]
  259.         self.done = False
  260.  
  261.     def trace(self, frame, event, arg):
  262.         if not self.done and frame.f_code == self.function.func_code:
  263.             firstLine = frame.f_code.co_firstlineno
  264.             if frame.f_lineno == firstLine + self.jumpFrom:
  265.                 # Cope with non-integer self.jumpTo (because of
  266.                 # no_jump_to_non_integers below).
  267.                 try:
  268.                     frame.f_lineno = firstLine + self.jumpTo
  269.                 except TypeError:
  270.                     frame.f_lineno = self.jumpTo
  271.                 self.done = True
  272.         return self.trace
  273.  
  274. # The first set of 'jump' tests are for things that are allowed:
  275.  
  276. def jump_simple_forwards(output):
  277.     output.append(1)
  278.     output.append(2)
  279.     output.append(3)
  280.  
  281. jump_simple_forwards.jump = (1, 3)
  282. jump_simple_forwards.output = [3]
  283.  
  284. def jump_simple_backwards(output):
  285.     output.append(1)
  286.     output.append(2)
  287.  
  288. jump_simple_backwards.jump = (2, 1)
  289. jump_simple_backwards.output = [1, 1, 2]
  290.  
  291. def jump_out_of_block_forwards(output):
  292.     for i in 1, 2:
  293.         output.append(2)
  294.         for j in [3]:  # Also tests jumping over a block
  295.             output.append(4)
  296.     output.append(5)
  297.  
  298. jump_out_of_block_forwards.jump = (3, 5)
  299. jump_out_of_block_forwards.output = [2, 5]
  300.  
  301. def jump_out_of_block_backwards(output):
  302.     output.append(1)
  303.     for i in [1]:
  304.         output.append(3)
  305.         for j in [2]:  # Also tests jumping over a block
  306.             output.append(5)
  307.         output.append(6)
  308.     output.append(7)
  309.  
  310. jump_out_of_block_backwards.jump = (6, 1)
  311. jump_out_of_block_backwards.output = [1, 3, 5, 1, 3, 5, 6, 7]
  312.  
  313. def jump_to_codeless_line(output):
  314.     output.append(1)
  315.     # Jumping to this line should skip to the next one.
  316.     output.append(3)
  317.  
  318. jump_to_codeless_line.jump = (1, 2)
  319. jump_to_codeless_line.output = [3]
  320.  
  321. def jump_to_same_line(output):
  322.     output.append(1)
  323.     output.append(2)
  324.     output.append(3)
  325.  
  326. jump_to_same_line.jump = (2, 2)
  327. jump_to_same_line.output = [1, 2, 3]
  328.  
  329. # Tests jumping within a finally block, and over one.
  330. def jump_in_nested_finally(output):
  331.     try:
  332.         output.append(2)
  333.     finally:
  334.         output.append(4)
  335.         try:
  336.             output.append(6)
  337.         finally:
  338.             output.append(8)
  339.         output.append(9)
  340.  
  341. jump_in_nested_finally.jump = (4, 9)
  342. jump_in_nested_finally.output = [2, 9]
  343.  
  344. # The second set of 'jump' tests are for things that are not allowed:
  345.  
  346. def no_jump_too_far_forwards(output):
  347.     try:
  348.         output.append(2)
  349.         output.append(3)
  350.     except ValueError, e:
  351.         output.append('after' in str(e))
  352.  
  353. no_jump_too_far_forwards.jump = (3, 6)
  354. no_jump_too_far_forwards.output = [2, True]
  355.  
  356. def no_jump_too_far_backwards(output):
  357.     try:
  358.         output.append(2)
  359.         output.append(3)
  360.     except ValueError, e:
  361.         output.append('before' in str(e))
  362.  
  363. no_jump_too_far_backwards.jump = (3, -1)
  364. no_jump_too_far_backwards.output = [2, True]
  365.  
  366. # Test each kind of 'except' line.
  367. def no_jump_to_except_1(output):
  368.     try:
  369.         output.append(2)
  370.     except:
  371.         e = sys.exc_info()[1]
  372.         output.append('except' in str(e))
  373.  
  374. no_jump_to_except_1.jump = (2, 3)
  375. no_jump_to_except_1.output = [True]
  376.  
  377. def no_jump_to_except_2(output):
  378.     try:
  379.         output.append(2)
  380.     except ValueError:
  381.         e = sys.exc_info()[1]
  382.         output.append('except' in str(e))
  383.  
  384. no_jump_to_except_2.jump = (2, 3)
  385. no_jump_to_except_2.output = [True]
  386.  
  387. def no_jump_to_except_3(output):
  388.     try:
  389.         output.append(2)
  390.     except ValueError, e:
  391.         output.append('except' in str(e))
  392.  
  393. no_jump_to_except_3.jump = (2, 3)
  394. no_jump_to_except_3.output = [True]
  395.  
  396. def no_jump_to_except_4(output):
  397.     try:
  398.         output.append(2)
  399.     except (ValueError, RuntimeError), e:
  400.         output.append('except' in str(e))
  401.  
  402. no_jump_to_except_4.jump = (2, 3)
  403. no_jump_to_except_4.output = [True]
  404.  
  405. def no_jump_forwards_into_block(output):
  406.     try:
  407.         output.append(2)
  408.         for i in 1, 2:
  409.             output.append(4)
  410.     except ValueError, e:
  411.         output.append('into' in str(e))
  412.  
  413. no_jump_forwards_into_block.jump = (2, 4)
  414. no_jump_forwards_into_block.output = [True]
  415.  
  416. def no_jump_backwards_into_block(output):
  417.     try:
  418.         for i in 1, 2:
  419.             output.append(3)
  420.         output.append(4)
  421.     except ValueError, e:
  422.         output.append('into' in str(e))
  423.  
  424. no_jump_backwards_into_block.jump = (4, 3)
  425. no_jump_backwards_into_block.output = [3, 3, True]
  426.  
  427. def no_jump_into_finally_block(output):
  428.     try:
  429.         try:
  430.             output.append(3)
  431.             x = 1
  432.         finally:
  433.             output.append(6)
  434.     except ValueError, e:
  435.         output.append('finally' in str(e))
  436.  
  437. no_jump_into_finally_block.jump = (4, 6)
  438. no_jump_into_finally_block.output = [3, 6, True]  # The 'finally' still runs
  439.  
  440. def no_jump_out_of_finally_block(output):
  441.     try:
  442.         try:
  443.             output.append(3)
  444.         finally:
  445.             output.append(5)
  446.             output.append(6)
  447.     except ValueError, e:
  448.         output.append('finally' in str(e))
  449.  
  450. no_jump_out_of_finally_block.jump = (5, 1)
  451. no_jump_out_of_finally_block.output = [3, True]
  452.  
  453. # This verifies the line-numbers-must-be-integers rule.
  454. def no_jump_to_non_integers(output):
  455.     try:
  456.         output.append(2)
  457.     except ValueError, e:
  458.         output.append('integer' in str(e))
  459.  
  460. no_jump_to_non_integers.jump = (2, "Spam")
  461. no_jump_to_non_integers.output = [True]
  462.  
  463. # This verifies that you can't set f_lineno via _getframe or similar
  464. # trickery.
  465. def no_jump_without_trace_function():
  466.     try:
  467.         previous_frame = sys._getframe().f_back
  468.         previous_frame.f_lineno = previous_frame.f_lineno
  469.     except ValueError, e:
  470.         # This is the exception we wanted; make sure the error message
  471.         # talks about trace functions.
  472.         if 'trace' not in str(e):
  473.             raise
  474.     else:
  475.         # Something's wrong - the expected exception wasn't raised.
  476.         raise RuntimeError, "Trace-function-less jump failed to fail"
  477.  
  478.  
  479. class JumpTestCase(unittest.TestCase):
  480.     def compare_jump_output(self, expected, received):
  481.         if received != expected:
  482.             self.fail( "Outputs don't match:\n" +
  483.                        "Expected: " + repr(expected) + "\n" +
  484.                        "Received: " + repr(received))
  485.  
  486.     def run_test(self, func):
  487.         tracer = JumpTracer(func)
  488.         sys.settrace(tracer.trace)
  489.         output = []
  490.         func(output)
  491.         sys.settrace(None)
  492.         self.compare_jump_output(func.output, output)
  493.  
  494.     def test_01_jump_simple_forwards(self):
  495.         self.run_test(jump_simple_forwards)
  496.     def test_02_jump_simple_backwards(self):
  497.         self.run_test(jump_simple_backwards)
  498.     def test_03_jump_out_of_block_forwards(self):
  499.         self.run_test(jump_out_of_block_forwards)
  500.     def test_04_jump_out_of_block_backwards(self):
  501.         self.run_test(jump_out_of_block_backwards)
  502.     def test_05_jump_to_codeless_line(self):
  503.         self.run_test(jump_to_codeless_line)
  504.     def test_06_jump_to_same_line(self):
  505.         self.run_test(jump_to_same_line)
  506.     def test_07_jump_in_nested_finally(self):
  507.         self.run_test(jump_in_nested_finally)
  508.     def test_08_no_jump_too_far_forwards(self):
  509.         self.run_test(no_jump_too_far_forwards)
  510.     def test_09_no_jump_too_far_backwards(self):
  511.         self.run_test(no_jump_too_far_backwards)
  512.     def test_10_no_jump_to_except_1(self):
  513.         self.run_test(no_jump_to_except_1)
  514.     def test_11_no_jump_to_except_2(self):
  515.         self.run_test(no_jump_to_except_2)
  516.     def test_12_no_jump_to_except_3(self):
  517.         self.run_test(no_jump_to_except_3)
  518.     def test_13_no_jump_to_except_4(self):
  519.         self.run_test(no_jump_to_except_4)
  520.     def test_14_no_jump_forwards_into_block(self):
  521.         self.run_test(no_jump_forwards_into_block)
  522.     def test_15_no_jump_backwards_into_block(self):
  523.         self.run_test(no_jump_backwards_into_block)
  524.     def test_16_no_jump_into_finally_block(self):
  525.         self.run_test(no_jump_into_finally_block)
  526.     def test_17_no_jump_out_of_finally_block(self):
  527.         self.run_test(no_jump_out_of_finally_block)
  528.     def test_18_no_jump_to_non_integers(self):
  529.         self.run_test(no_jump_to_non_integers)
  530.     def test_19_no_jump_without_trace_function(self):
  531.         no_jump_without_trace_function()
  532.  
  533. def test_main():
  534.     test_support.run_unittest(
  535.         TraceTestCase,
  536.         RaisingTraceFuncTestCase,
  537.         JumpTestCase
  538.     )
  539.  
  540. if __name__ == "__main__":
  541.     test_main()
  542.