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"""
Test that lldb watchpoint works for multiple threads.
"""
from __future__ import print_function
import os, time
import re
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class WatchpointForMultipleThreadsTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
@expectedFailureAndroid(archs=['arm', 'aarch64']) # Watchpoints not supported
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
def test_watchpoint_multiple_threads(self):
"""Test that lldb watchpoint works for multiple threads."""
self.build()
self.setTearDownCleanup()
self.hello_multiple_threads()
@expectedFailureAndroid(archs=['arm', 'aarch64']) # Watchpoints not supported
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
def test_watchpoint_multiple_threads_wp_set_and_then_delete(self):
"""Test that lldb watchpoint works for multiple threads, and after the watchpoint is deleted, the watchpoint event should no longer fires."""
self.build()
self.setTearDownCleanup()
self.hello_multiple_threads_wp_set_and_then_delete()
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Our simple source filename.
self.source = 'main.cpp'
# Find the line number to break inside main().
self.first_stop = line_number(self.source, '// Set break point at this line')
def hello_multiple_threads(self):
"""Test that lldb watchpoint works for multiple threads."""
self.runCmd("file %s" % os.path.join(os.getcwd(), 'a.out'), CURRENT_EXECUTABLE_SET)
# Add a breakpoint to set a watchpoint when stopped on the breakpoint.
lldbutil.run_break_set_by_file_and_line (self, None, self.first_stop, num_expected_locations=1)
# Run the program.
self.runCmd("run", RUN_SUCCEEDED)
# We should be stopped again due to the breakpoint.
# The stop reason of the thread should be breakpoint.
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs = ['stopped',
'stop reason = breakpoint'])
# Now let's set a write-type watchpoint for variable 'g_val'.
self.expect("watchpoint set variable -w write g_val", WATCHPOINT_CREATED,
substrs = ['Watchpoint created', 'size = 4', 'type = w'])
# Use the '-v' option to do verbose listing of the watchpoint.
# The hit count should be 0 initially.
self.expect("watchpoint list -v",
substrs = ['hit_count = 0'])
while True:
self.runCmd("process continue")
self.runCmd("thread list")
if "stop reason = watchpoint" in self.res.GetOutput():
# Good, we verified that the watchpoint works!
self.runCmd("thread backtrace all")
break
else:
self.fail("The stop reason should be either break or watchpoint")
# Use the '-v' option to do verbose listing of the watchpoint.
# The hit count should now be 1.
self.expect("watchpoint list -v",
substrs = ['hit_count = 1'])
def hello_multiple_threads_wp_set_and_then_delete(self):
"""Test that lldb watchpoint works for multiple threads, and after the watchpoint is deleted, the watchpoint event should no longer fires."""
self.runCmd("file %s" % os.path.join(os.getcwd(), 'a.out'), CURRENT_EXECUTABLE_SET)
# Add a breakpoint to set a watchpoint when stopped on the breakpoint.
lldbutil.run_break_set_by_file_and_line (self, None, self.first_stop, num_expected_locations=1)
# Run the program.
self.runCmd("run", RUN_SUCCEEDED)
# We should be stopped again due to the breakpoint.
# The stop reason of the thread should be breakpoint.
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs = ['stopped',
'stop reason = breakpoint'])
# Now let's set a write-type watchpoint for variable 'g_val'.
self.expect("watchpoint set variable -w write g_val", WATCHPOINT_CREATED,
substrs = ['Watchpoint created', 'size = 4', 'type = w'])
# Use the '-v' option to do verbose listing of the watchpoint.
# The hit count should be 0 initially.
self.expect("watchpoint list -v",
substrs = ['hit_count = 0'])
watchpoint_stops = 0
while True:
self.runCmd("process continue")
self.runCmd("process status")
if re.search("Process .* exited", self.res.GetOutput()):
# Great, we are done with this test!
break
self.runCmd("thread list")
if "stop reason = watchpoint" in self.res.GetOutput():
self.runCmd("thread backtrace all")
watchpoint_stops += 1
if watchpoint_stops > 1:
self.fail("Watchpoint hits not supposed to exceed 1 by design!")
# Good, we verified that the watchpoint works! Now delete the watchpoint.
if self.TraceOn():
print("watchpoint_stops=%d at the moment we delete the watchpoint" % watchpoint_stops)
self.runCmd("watchpoint delete 1")
self.expect("watchpoint list -v",
substrs = ['No watchpoints currently set.'])
continue
else:
self.fail("The stop reason should be either break or watchpoint")
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