def test_trash_stack(self):
def f():
for i in range(5):
print i # line tracing will raise an exception at this line
def g(frame, why, extra):
if (why == 'line' and
frame.f_lineno == f.func_code.co_firstlineno + 2):
raise RuntimeError, "i am crashing"
return g
sys.settrace(g)
try:
f()
except RuntimeError:
# the test is really that this doesn't segfault:
import gc
gc.collect()
else:
self.fail("exception not propagated")
# 'Jump' tests: assigning to frame.f_lineno within a trace function
# moves the execution position - it's how debuggers implement a Jump
# command (aka. "Set next statement").
python类settrace()的实例源码
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:
func_code = code
jump = (2, 0)
tracer = JumpTracer(fake_function)
sys.settrace(tracer.trace)
namespace = {"output": []}
exec code in namespace
sys.settrace(None)
self.compare_jump_output([2, 3, 2, 3, 4], namespace["output"])
def run(self, cmd, globals=None, locals=None):
if globals is None:
import __main__
globals = __main__.__dict__
if locals is None:
locals = globals
self.reset()
sys.settrace(self.trace_dispatch)
if not isinstance(cmd, types.CodeType):
cmd = cmd+'\n'
try:
exec cmd in globals, locals
except BdbQuit:
pass
finally:
self.quitting = 1
sys.settrace(None)
def no_tracing(func):
"""Decorator to temporarily turn off tracing for the duration of a test."""
if not hasattr(sys, 'gettrace'):
return func
else:
def wrapper(*args, **kwargs):
original_trace = sys.gettrace()
try:
sys.settrace(None)
return func(*args, **kwargs)
finally:
sys.settrace(original_trace)
wrapper.__name__ = func.__name__
return wrapper
# Return True if opcode code appears in the pickle, else False.
def testLocalsClass_WithTrace(self):
# Issue23728: after the trace function returns, the locals()
# dictionary is used to update all variables, this used to
# include free variables. But in class statements, free
# variables are not inserted...
import sys
sys.settrace(lambda a,b,c:None)
try:
x = 12
class C:
def f(self):
return x
self.assertEqual(x, 12) # Used to raise UnboundLocalError
finally:
sys.settrace(None)
def testInteractionWithTraceFunc(self):
import sys
def tracer(a,b,c):
return tracer
def adaptgetter(name, klass, getter):
kind, des = getter
if kind == 1: # AV happens when stepping from this line to next
if des == "":
des = "_%s__%s" % (klass.__name__, name)
return lambda obj: getattr(obj, des)
class TestClass:
pass
sys.settrace(tracer)
adaptgetter("foo", TestClass, (1, ""))
sys.settrace(None)
self.assertRaises(TypeError, sys.settrace)
def run_test_for_event(self, event):
"""Tests that an exception raised in response to the given event is
handled OK."""
self.raiseOnEvent = event
try:
for i in xrange(sys.getrecursionlimit() + 1):
sys.settrace(self.trace)
try:
self.f()
except ValueError:
pass
else:
self.fail("exception not raised!")
except RuntimeError:
self.fail("recursion counter not reset")
# Test the handling of exceptions raised by each kind of trace event.
def test_trash_stack(self):
def f():
for i in range(5):
print i # line tracing will raise an exception at this line
def g(frame, why, extra):
if (why == 'line' and
frame.f_lineno == f.func_code.co_firstlineno + 2):
raise RuntimeError, "i am crashing"
return g
sys.settrace(g)
try:
f()
except RuntimeError:
# the test is really that this doesn't segfault:
import gc
gc.collect()
else:
self.fail("exception not propagated")
# 'Jump' tests: assigning to frame.f_lineno within a trace function
# moves the execution position - it's how debuggers implement a Jump
# command (aka. "Set next statement").
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:
func_code = code
jump = (2, 0)
tracer = JumpTracer(fake_function)
sys.settrace(tracer.trace)
namespace = {"output": []}
exec code in namespace
sys.settrace(None)
self.compare_jump_output([2, 3, 2, 3, 4], namespace["output"])
def spewer(frame, s, ignored):
"""A trace function for sys.settrace that prints every function or method call."""
from twisted.python import reflect
if frame.f_locals.has_key('self'):
se = frame.f_locals['self']
if hasattr(se, '__class__'):
k = reflect.qual(se.__class__)
else:
k = reflect.qual(type(se))
print 'method %s of %s at %s' % (
frame.f_code.co_name, k, id(se)
)
else:
print 'function %s in %s, line %s' % (
frame.f_code.co_name,
frame.f_code.co_filename,
frame.f_lineno)
def run():
if len(sys.argv) == 1:
sys.argv.append("--help")
config = Options()
try:
config.parseOptions()
except usage.error, ue:
raise SystemExit, "%s: %s" % (sys.argv[0], ue)
_initialDebugSetup(config)
trialRunner = _makeRunner(config)
suite = _getSuite(config)
if config['until-failure']:
test_result = trialRunner.runUntilFailure(suite)
else:
test_result = trialRunner.run(suite)
if config.tracer:
sys.settrace(None)
results = config.tracer.results()
results.write_results(show_missing=1, summary=False,
coverdir=config.coverdir)
sys.exit(not test_result.wasSuccessful())
def runeval(self, expr, globals=None, locals=None):
if globals is None:
import __main__
globals = __main__.__dict__
if locals is None:
locals = globals
self.reset()
sys.settrace(self.trace_dispatch)
if not isinstance(expr, types.CodeType):
expr = expr+'\n'
try:
return eval(expr, globals, locals)
except BdbQuit:
pass
finally:
self.quitting = 1
sys.settrace(None)
def do_debug(self, arg):
sys.settrace(None)
globals = self.curframe.f_globals
locals = self.curframe_locals
p = Pdb(self.completekey, self.stdin, self.stdout)
p.prompt = "(%s) " % self.prompt.strip()
print >>self.stdout, "ENTERING RECURSIVE DEBUGGER"
sys.call_tracing(p.run, (arg, globals, locals))
print >>self.stdout, "LEAVING RECURSIVE DEBUGGER"
sys.settrace(self.trace_dispatch)
self.lastcmd = p.lastcmd
def set_trace(self, frame=None):
"""Start debugging from `frame`.
If frame is not specified, debugging starts from caller's frame.
"""
if frame is None:
frame = sys._getframe().f_back
self.reset()
while frame:
frame.f_trace = self.trace_dispatch
self.botframe = frame
frame = frame.f_back
self.set_step()
sys.settrace(self.trace_dispatch)
def set_quit(self):
self.stopframe = self.botframe
self.returnframe = None
self.quitting = 1
sys.settrace(None)
# Derived classes and clients can call the following methods
# to manipulate breakpoints. These methods return an
# error message is something went wrong, None if all is well.
# Set_break prints out the breakpoint line and file:lineno.
# Call self.get_*break*() to see the breakpoints or better
# for bp in Breakpoint.bpbynumber: if bp: bp.bpprint().
def runcall(self, func, *args, **kwds):
self.reset()
sys.settrace(self.trace_dispatch)
res = None
try:
res = func(*args, **kwds)
except BdbQuit:
pass
finally:
self.quitting = 1
sys.settrace(None)
return res
def settrace(func):
global _trace_hook
_trace_hook = func
# Synchronization classes
def set_continue(self):
# Calling set_continue unconditionally would break unit test
# coverage reporting, as Bdb.set_continue calls sys.settrace(None).
if self.__debugger_used:
pdb.Pdb.set_continue(self)
def _unsettrace():
sys.settrace(None)
def _settrace(func):
threading.settrace(func)
sys.settrace(func)
