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"""
Use lldb Python SBtarget.WatchpointCreateByAddress() 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 TargetWatchpointCreateByAddressPITestCase(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"
def test_watch_address(self):
"""Exercise SBTarget.WatchpointCreateByAddress() 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()
wp_opts = lldb.SBWatchpointOptions()
wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify)
watchpoint = target.WatchpointCreateByAddress(
value.GetValueAsUnsigned(), 1, wp_opts, error
)
self.assertTrue(
value and watchpoint, "Successfully found the pointer and set a watchpoint"
)
self.DebugSBValue(value)
self.DebugSBValue(pointee)
# 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.
# No size constraint on MIPS for watches
@skipIf(archs=["mips", "mipsel", "mips64", "mips64el"])
@skipIf(archs=["s390x"]) # Likewise on SystemZ
def test_watch_address_with_invalid_watch_size(self):
"""Exercise SBTarget.WatchpointCreateByAddress() API but pass an invalid watch_size."""
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()
)
# debugserver on Darwin AArch64 systems can watch large regions
# of memory via https://reviews.llvm.org/D149792 , don't run this
# test there.
if self.getArchitecture() not in ["arm64", "arm64e", "arm64_32"]:
# Watch for write to *g_char_ptr.
error = lldb.SBError()
wp_opts = lldb.SBWatchpointOptions()
wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify)
watchpoint = target.WatchpointCreateByAddress(
value.GetValueAsUnsigned(), 365, wp_opts, error
)
self.assertFalse(watchpoint)
self.expect(
error.GetCString(),
exe=False,
substrs=["Setting one of the watchpoint resources failed"],
)
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