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"""
Test lldb Python event APIs.
"""
import os, time
import re
import unittest2
import lldb, lldbutil
from lldbtest import *
class EventAPITestCase(TestBase):
mydir = os.path.join("python_api", "event")
@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
@python_api_test
def test_wait_for_event_with_dsym(self):
"""Exercise SBListener.WaitForEvent() API."""
self.buildDsym()
self.do_wait_for_event()
@python_api_test
def test_wait_for_event_with_dwarf(self):
"""Exercise SBListener.WaitForEvent() API."""
self.buildDwarf()
self.do_wait_for_event()
@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
@python_api_test
def test_add_listener_to_broadcaster_dsym(self):
"""Exercise some SBBroadcaster APIs."""
self.buildDsym()
self.do_add_listener_to_broadcaster()
@python_api_test
def test_add_listener_to_broadcaster_dwarf(self):
"""Exercise some SBBroadcaster APIs."""
self.buildDwarf()
self.do_add_listener_to_broadcaster()
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number to of function 'c'.
self.line = line_number('main.c', '// Find the line number of function "c" here.')
def do_wait_for_event(self):
"""Get the listener associated with the debugger and exercise WaitForEvent API."""
exe = os.path.join(os.getcwd(), "a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target.IsValid(), VALID_TARGET)
# Now create a breakpoint on main.c by name 'c'.
breakpoint = target.BreakpointCreateByName('c', 'a.out')
#print "breakpoint:", breakpoint
self.assertTrue(breakpoint.IsValid() and
breakpoint.GetNumLocations() == 1,
VALID_BREAKPOINT)
# Get the debugger listener.
listener = self.dbg.GetListener()
# Now launch the process, and do not stop at entry point.
error = lldb.SBError()
self.process = target.Launch (listener, None, None, os.ctermid(), os.ctermid(), os.ctermid(), None, 0, False, error)
self.process = target.GetProcess()
self.assertTrue(self.process.IsValid(), PROCESS_IS_VALID)
# Get a handle on the process's broadcaster.
broadcaster = self.process.GetBroadcaster()
self.assertTrue(broadcaster.IsValid(), "Process with valid broadcaster")
# Create an empty event object.
event = lldb.SBEvent()
self.assertFalse(event.IsValid(), "Event should not be valid initially")
# Create MyListeningThread to wait for any kind of event.
import threading
class MyListeningThread(threading.Thread):
def run(self):
count = 0
# Let's only try at most 3 times to retrieve any kind of event.
while not count > 3:
if listener.WaitForEvent(5, event):
#print "Got a valid event:", event
return
count = count + 1
print "Timeout: listener.WaitForEvent"
return
# Use Python API to kill the process. The listening thread should be
# able to receive a state changed event.
self.process.Kill()
# Let's start the listening thread to retrieve the event.
my_thread = MyListeningThread()
my_thread.start()
# Wait until the 'MyListeningThread' terminates.
my_thread.join()
self.assertTrue(event.IsValid(),
"My listening thread successfully received an event")
def do_add_listener_to_broadcaster(self):
"""Get the broadcaster associated with the process and wait for broadcaster events."""
exe = os.path.join(os.getcwd(), "a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target.IsValid(), VALID_TARGET)
# Now create a breakpoint on main.c by name 'c'.
breakpoint = target.BreakpointCreateByName('c', 'a.out')
#print "breakpoint:", breakpoint
self.assertTrue(breakpoint.IsValid() and
breakpoint.GetNumLocations() == 1,
VALID_BREAKPOINT)
# Now launch the process, and do not stop at the entry point.
self.process = target.LaunchSimple(None, None, os.getcwd())
self.process = target.GetProcess()
self.assertTrue(self.process.GetState() == lldb.eStateStopped,
PROCESS_STOPPED)
# Get a handle on the process's broadcaster.
broadcaster = self.process.GetBroadcaster()
self.assertTrue(broadcaster.IsValid(), "Process with valid broadcaster")
# Create an empty event object.
event = lldb.SBEvent()
self.assertFalse(event.IsValid(), "Event should not be valid initially")
# Create a listener object and register with the broadcaster.
listener = lldb.SBListener("TestEvents.listener")
rc = broadcaster.AddListener(listener, lldb.SBProcess.eBroadcastBitStateChanged)
self.assertTrue(rc, "AddListener successfully retruns")
# The finite state machine for our custom listening thread, with an
# initail state of 0, which means a "running" event is expected.
# It changes to 1 after "running" is received.
# It cahnges to 2 after "stopped" is received.
# 2 will be our final state and the test is complete.
self.state = 0
# Create MyListeningThread to wait for state changed events.
# By design, a "running" event is expected following by a "stopped" event.
import threading
class MyListeningThread(threading.Thread):
def run(self):
#print "Running MyListeningThread:", self
# Regular expression pattern for the event description.
pattern = re.compile("data = {.*, state = (.*)}$")
# Let's only try at most 6 times to retrieve our events.
count = 0
while True:
if listener.WaitForEventForBroadcasterWithType(5,
broadcaster,
lldb.SBProcess.eBroadcastBitStateChanged,
event):
stream = lldb.SBStream()
event.GetDescription(stream)
description = stream.GetData()
#print "Event description:", description
match = pattern.search(description)
if not match:
break;
if self.context.state == 0 and match.group(1) == 'running':
self.context.state = 1
continue
elif self.context.state == 1 and match.group(1) == 'stopped':
# Whoopee, both events have been received!
self.context.state = 2
break
else:
break
print "Timeout: listener.WaitForEvent"
count = count + 1
if count > 6:
break
return
# Use Python API to continue the process. The listening thread should be
# able to receive the state changed events.
self.process.Continue()
# Start the listening thread to receive the "running" followed by the
# "stopped" events.
my_thread = MyListeningThread()
# Supply the enclosing context so that our listening thread can access
# the 'state' variable.
my_thread.context = self
my_thread.start()
# Wait until the 'MyListeningThread' terminates.
my_thread.join()
# We are no longer interested in receiving state changed events.
# Remove our custom listener before the inferior is killed.
broadcaster.RemoveListener(listener, lldb.SBProcess.eBroadcastBitStateChanged)
# The final judgement. :-)
self.assertTrue(self.state == 2,
"Both expected state changed events received")
if __name__ == '__main__':
import atexit
lldb.SBDebugger.Initialize()
atexit.register(lambda: lldb.SBDebugger.Terminate())
unittest2.main()
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