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"""
Use lldb Python SBTarget API to iterate on the watchpoint(s) for the target.
"""
import os, time
import re
import unittest2
import lldb, lldbutil
from lldbtest import *
class WatchpointLocationIteratorTestCase(TestBase):
mydir = os.path.join("python_api", "watchpoint")
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Our simple source filename.
self.source = 'main.c'
# Find the line number to break inside main().
self.line = line_number(self.source, '// Set break point at this line.')
@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
@python_api_test
def test_watch_loc_iter_with_dsym(self):
"""Exercise SBTarget.watchpoint_location_iter() API to iterate on the available watchpoint locations."""
self.buildDsym()
self.do_watchpoint_location_iter()
@python_api_test
def test_watch_loc_iter_with_dwarf(self):
"""Exercise SBTarget.watchpoint_location_iter() API to iterate on the available watchpoint locations."""
self.buildDwarf()
self.do_watchpoint_location_iter()
def do_watchpoint_location_iter(self):
"""Use SBTarget.watchpoint_location_iter() to do Pythonic iteration on the available watchpoint locations."""
exe = os.path.join(os.getcwd(), "a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Create a breakpoint on main.c in order to set our watchpoint later.
breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
self.assertTrue(breakpoint and
breakpoint.GetNumLocations() == 1,
VALID_BREAKPOINT)
# Now launch the process, and do not stop at the entry point.
process = target.LaunchSimple(None, None, os.getcwd())
# We should be stopped due to the breakpoint. Get frame #0.
process = target.GetProcess()
self.assertTrue(process.GetState() == lldb.eStateStopped,
PROCESS_STOPPED)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
frame0 = thread.GetFrameAtIndex(0)
value = frame0.WatchValue('global',
lldb.eValueTypeVariableGlobal,
lldb.LLDB_WATCH_TYPE_READ|lldb.LLDB_WATCH_TYPE_WRITE)
self.assertTrue(value, "Successfully found the variable and set a watchpoint")
self.DebugSBValue(value)
# There should be only 1 watchpoint location under the target.
self.assertTrue(target.GetNumWatchpointLocations() == 1)
wp_loc = target.GetWatchpointLocationAtIndex(0)
self.assertTrue(wp_loc.IsEnabled())
watch_id = wp_loc.GetID()
self.assertTrue(watch_id != 0)
# Continue. Expect the program to stop due to the variable being written to.
process.Continue()
# Hide stdout if not running with '-t' option.
if not self.TraceOn():
self.HideStdout()
# Print the stack traces.
lldbutil.print_stacktraces(process)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonWatchpoint)
self.assertTrue(thread, "The thread stopped due to watchpoint")
self.DebugSBValue(value)
# We currently only support hardware watchpoint. Verify that we have a
# meaningful hardware index at this point. Exercise the printed repr of
# SBWatchpointLocation.
print wp_loc
self.assertTrue(wp_loc.GetHardwareIndex() != -1)
# Now disable the 'rw' watchpoint. The program won't stop when it reads
# 'global' next.
wp_loc.SetEnabled(False)
self.assertTrue(wp_loc.GetHardwareIndex() == -1)
self.assertFalse(wp_loc.IsEnabled())
# Continue. The program does not stop again when the variable is being
# read from because the watchpoint location has been disabled.
process.Continue()
# At this point, the inferior process should have exited.
self.assertTrue(process.GetState() == lldb.eStateExited, PROCESS_EXITED)
# Verify some vital statistics and exercise the iterator API.
for wp_loc in target.watchpoint_location_iter():
self.assertTrue(wp_loc)
self.assertTrue(wp_loc.GetWatchSize() == 4)
self.assertTrue(wp_loc.GetHitCount() == 1)
print wp_loc
if __name__ == '__main__':
import atexit
lldb.SBDebugger.Initialize()
atexit.register(lambda: lldb.SBDebugger.Terminate())
unittest2.main()
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