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import lldb
import time
import unittest
from lldbsuite.test.lldbtest import *
from lldbsuite.test.decorators import *
from lldbsuite.test.gdbclientutils import *
from lldbsuite.test.lldbreverse import ReverseTestBase
from lldbsuite.test import lldbutil
class TestReverseContinueWatchpoints(ReverseTestBase):
@skipIfRemote
# Watchpoints don't work in single-step mode
@skipIf(macos_version=["<", "15.0"], archs=["arm64"])
def test_reverse_continue_watchpoint(self):
self.reverse_continue_watchpoint_internal(async_mode=False)
@skipIfRemote
# Watchpoints don't work in single-step mode
@skipIf(macos_version=["<", "15.0"], archs=["arm64"])
def test_reverse_continue_watchpoint_async(self):
self.reverse_continue_watchpoint_internal(async_mode=True)
def reverse_continue_watchpoint_internal(self, async_mode):
target, process, initial_threads, watch_addr = self.setup_recording(async_mode)
error = lldb.SBError()
wp_opts = lldb.SBWatchpointOptions()
wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify)
watchpoint = target.WatchpointCreateByAddress(watch_addr, 4, wp_opts, error)
self.assertTrue(watchpoint)
watch_var = target.EvaluateExpression("*g_watched_var_ptr")
self.assertEqual(watch_var.GetValueAsSigned(-1), 2)
# Reverse-continue to the function "trigger_watchpoint".
status = process.ContinueInDirection(lldb.eRunReverse)
self.assertSuccess(status)
self.expect_async_state_changes(
async_mode, process, [lldb.eStateRunning, lldb.eStateStopped]
)
# We should stop at the point just before the location was modified.
watch_var = target.EvaluateExpression("*g_watched_var_ptr")
self.assertEqual(watch_var.GetValueAsSigned(-1), 1)
self.expect(
"thread list",
STOPPED_DUE_TO_WATCHPOINT,
substrs=["stopped", "trigger_watchpoint", "stop reason = watchpoint 1"],
)
# Stepping forward one instruction should change the value of the variable.
initial_threads[0].StepInstruction(False)
self.expect_async_state_changes(
async_mode, process, [lldb.eStateRunning, lldb.eStateStopped]
)
watch_var = target.EvaluateExpression("*g_watched_var_ptr")
self.assertEqual(watch_var.GetValueAsSigned(-1), 2)
self.expect(
"thread list",
STOPPED_DUE_TO_WATCHPOINT,
substrs=["stopped", "trigger_watchpoint", "stop reason = watchpoint 1"],
)
@skipIfRemote
# Watchpoints don't work in single-step mode
@skipIf(macos_version=["<", "15.0"], archs=["arm64"])
@skipIf(
oslist=["windows"],
archs=["x86_64"],
bugnumber="github.com/llvm/llvm-project/issues/138084",
)
def test_reverse_continue_skip_watchpoint(self):
self.reverse_continue_skip_watchpoint_internal(async_mode=False)
@skipIfRemote
# Watchpoints don't work in single-step mode
@skipIf(macos_version=["<", "15.0"], archs=["arm64"])
@skipIf(
oslist=["windows"],
archs=["x86_64"],
bugnumber="github.com/llvm/llvm-project/issues/138084",
)
def test_reverse_continue_skip_watchpoint_async(self):
self.reverse_continue_skip_watchpoint_internal(async_mode=True)
def reverse_continue_skip_watchpoint_internal(self, async_mode):
target, process, initial_threads, watch_addr = self.setup_recording(async_mode)
# Reverse-continue over a watchpoint whose condition is false
# (via function call).
# This tests that we continue in the correct direction after hitting
# the watchpoint.
error = lldb.SBError()
wp_opts = lldb.SBWatchpointOptions()
wp_opts.SetWatchpointTypeWrite(lldb.eWatchpointWriteTypeOnModify)
watchpoint = target.WatchpointCreateByAddress(watch_addr, 4, wp_opts, error)
self.assertTrue(watchpoint)
watchpoint.SetCondition("false_condition()")
status = process.ContinueInDirection(lldb.eRunReverse)
self.expect_async_state_changes(
async_mode, process, [lldb.eStateRunning, lldb.eStateStopped]
)
self.assertSuccess(status)
self.expect(
"thread list",
STOPPED_DUE_TO_HISTORY_BOUNDARY,
substrs=["stopped", "stop reason = history boundary"],
)
def setup_recording(self, async_mode):
"""
Record execution of code between "start_recording" and "stop_recording" breakpoints.
Returns with the target stopped at "stop_recording", with recording disabled,
ready to reverse-execute.
"""
self.build()
target = self.dbg.CreateTarget(self.getBuildArtifact("a.out"))
process = self.connect(target)
# Record execution from the start of the function "start_recording"
# to the start of the function "stop_recording". We want to keep the
# interval that we record as small as possible to minimize the run-time
# of our single-stepping recorder.
start_recording_bkpt = target.BreakpointCreateByName("start_recording", None)
self.assertTrue(start_recording_bkpt.GetNumLocations() > 0)
initial_threads = lldbutil.continue_to_breakpoint(process, start_recording_bkpt)
self.assertEqual(len(initial_threads), 1)
target.BreakpointDelete(start_recording_bkpt.GetID())
frame0 = initial_threads[0].GetFrameAtIndex(0)
watched_var_ptr = frame0.FindValue(
"g_watched_var_ptr", lldb.eValueTypeVariableGlobal
)
watch_addr = watched_var_ptr.GetValueAsUnsigned(0)
self.assertTrue(watch_addr > 0)
self.start_recording()
stop_recording_bkpt = target.BreakpointCreateByName("stop_recording", None)
self.assertTrue(stop_recording_bkpt.GetNumLocations() > 0)
lldbutil.continue_to_breakpoint(process, stop_recording_bkpt)
target.BreakpointDelete(stop_recording_bkpt.GetID())
self.stop_recording()
self.dbg.SetAsync(async_mode)
self.expect_async_state_changes(async_mode, process, [lldb.eStateStopped])
return target, process, initial_threads, watch_addr
def expect_async_state_changes(self, async_mode, process, states):
if not async_mode:
return
listener = self.dbg.GetListener()
lldbutil.expect_state_changes(self, listener, process, states)
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