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"""
Use lldb Python SBValue.WatchPointee() API to create a watchpoint for write of '*g_char_ptr'.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class SetWatchlocationAPITestCase(TestBase):
NO_DEBUG_INFO_TESTCASE = True
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.line = line_number(self.source, "// Set break point at this line.")
# This is for verifying that watch location works.
self.violating_func = "do_bad_thing_with_location"
@skipIfWindows # This test is flaky on Windows
def test_watch_location(self):
"""Exercise SBValue.WatchPointee() 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.assertState(process.GetState(), lldb.eStateStopped, PROCESS_STOPPED)
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
frame0 = thread.GetFrameAtIndex(0)
value = frame0.FindValue("g_char_ptr", lldb.eValueTypeVariableGlobal)
pointee = value.CreateValueFromAddress(
"pointee", value.GetValueAsUnsigned(0), value.GetType().GetPointeeType()
)
# Watch for write to *g_char_ptr.
error = lldb.SBError()
watchpoint = value.WatchPointee(True, False, True, error)
self.assertTrue(
value and watchpoint, "Successfully found the pointer and set a watchpoint"
)
self.DebugSBValue(value)
self.DebugSBValue(pointee)
# Check some API calls return expected values
self.assertEqual(
watchpoint.GetWatchValueKind(), lldb.eWatchPointValueKindExpression
)
# FIXME: The spec should probably be 'g_char_ptr'
self.assertEqual(watchpoint.GetWatchSpec(), None)
self.assertEqual(watchpoint.GetType().GetDisplayTypeName(), "char")
self.assertFalse(watchpoint.IsWatchingReads())
self.assertTrue(watchpoint.IsWatchingWrites())
# 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)
self.DebugSBValue(pointee)
self.expect(
lldbutil.print_stacktrace(thread, string_buffer=True),
exe=False,
substrs=[self.violating_func],
)
# This finishes our test.
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