TestSetWatchpoint.py
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"""
Use lldb Python SBValue API to create a watchpoint for read_write of 'globl' var.
"""
from __future__ import print_function
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class SetWatchpointAPITestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
NO_DEBUG_INFO_TESTCASE = True
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.')
@add_test_categories(['pyapi'])
# Read-write watchpoints not supported on SystemZ
@expectedFailureAll(archs=['s390x'])
def test_watch_val(self):
"""Exercise SBValue.Watch() API to set a watchpoint."""
self.build()
exe = self.getBuildArtifact("a.out")
# Create a target by the debugger.
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Now create a breakpoint on main.c.
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, self.get_process_working_directory())
# 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)
# Watch 'global' for read and write.
value = frame0.FindValue('global', lldb.eValueTypeVariableGlobal)
error = lldb.SBError()
watchpoint = value.Watch(True, True, True, error)
self.assertTrue(value and watchpoint,
"Successfully found the variable and set a watchpoint")
self.DebugSBValue(value)
# Hide stdout if not running with '-t' option.
if not self.TraceOn():
self.HideStdout()
print(watchpoint)
# Continue. Expect the program to stop due to the variable being
# written to.
process.Continue()
if (self.TraceOn()):
lldbutil.print_stacktraces(process)
thread = lldbutil.get_stopped_thread(
process, lldb.eStopReasonWatchpoint)
self.assertTrue(thread, "The thread stopped due to watchpoint")
self.DebugSBValue(value)
# Continue. Expect the program to stop due to the variable being read
# from.
process.Continue()
if (self.TraceOn()):
lldbutil.print_stacktraces(process)
thread = lldbutil.get_stopped_thread(
process, lldb.eStopReasonWatchpoint)
self.assertTrue(thread, "The thread stopped due to watchpoint")
self.DebugSBValue(value)
# Continue the process. We don't expect the program to be stopped
# again.
process.Continue()
# At this point, the inferior process should have exited.
self.assertTrue(
process.GetState() == lldb.eStateExited,
PROCESS_EXITED)
self.dbg.DeleteTarget(target)
# The next check relies on the watchpoint being destructed, which does
# not happen during replay because objects are intentionally kept alive
# forever.
if not configuration.is_reproducer():
self.assertFalse(watchpoint.IsValid())