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"""Test stepping over watchpoints."""
from __future__ import print_function
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestStepOverWatchpoint(TestBase):
mydir = TestBase.compute_mydir(__file__)
def getCategories(self):
return ['basic_process']
@expectedFailureAndroid(archs=['arm', 'aarch64']) # Watchpoints not supported
@expectedFailureAll(oslist=["linux"], archs=['aarch64', 'arm'], bugnumber="llvm.org/pr26031")
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
@expectedFailureAll(archs=['s390x']) # Read-write watchpoints not supported on SystemZ
def test(self):
"""Test stepping over watchpoints."""
self.build()
exe = os.path.join(os.getcwd(), 'a.out')
target = self.dbg.CreateTarget(exe)
self.assertTrue(self.target, VALID_TARGET)
lldbutil.run_break_set_by_symbol(self, 'main')
process = target.LaunchSimple(None, None,
self.get_process_working_directory())
self.assertTrue(process.IsValid(), PROCESS_IS_VALID)
self.assertTrue(process.GetState() == lldb.eStateStopped,
PROCESS_STOPPED)
thread = lldbutil.get_stopped_thread(process,
lldb.eStopReasonBreakpoint)
self.assertTrue(thread.IsValid(), "Failed to get thread.")
frame = thread.GetFrameAtIndex(0)
self.assertTrue(frame.IsValid(), "Failed to get frame.")
read_value = frame.FindValue('g_watch_me_read',
lldb.eValueTypeVariableGlobal)
self.assertTrue(read_value.IsValid(), "Failed to find read value.")
error = lldb.SBError()
# resolve_location=True, read=True, write=False
read_watchpoint = read_value.Watch(True, True, False, error)
self.assertTrue(error.Success(),
"Error while setting watchpoint: %s" %
error.GetCString())
self.assertTrue(read_watchpoint, "Failed to set read watchpoint.")
thread.StepOver()
self.assertTrue(thread.GetStopReason() == lldb.eStopReasonWatchpoint,
STOPPED_DUE_TO_WATCHPOINT)
self.assertTrue(thread.GetStopDescription(20) == 'watchpoint 1')
process.Continue()
self.assertTrue(process.GetState() == lldb.eStateStopped,
PROCESS_STOPPED)
self.assertTrue(thread.GetStopDescription(20) == 'step over')
self.step_inst_for_watchpoint(1)
write_value = frame.FindValue('g_watch_me_write',
lldb.eValueTypeVariableGlobal)
self.assertTrue(write_value, "Failed to find write value.")
# Most of the MIPS boards provide only one H/W watchpoints, and S/W watchpoints are not supported yet
arch = self.getArchitecture()
if re.match("^mips",arch):
self.runCmd("watchpoint delete 1")
# resolve_location=True, read=False, write=True
write_watchpoint = write_value.Watch(True, False, True, error)
self.assertTrue(read_watchpoint, "Failed to set write watchpoint.")
self.assertTrue(error.Success(),
"Error while setting watchpoint: %s" %
error.GetCString())
thread.StepOver()
self.assertTrue(thread.GetStopReason() == lldb.eStopReasonWatchpoint,
STOPPED_DUE_TO_WATCHPOINT)
self.assertTrue(thread.GetStopDescription(20) == 'watchpoint 2')
process.Continue()
self.assertTrue(process.GetState() == lldb.eStateStopped,
PROCESS_STOPPED)
self.assertTrue(thread.GetStopDescription(20) == 'step over')
self.step_inst_for_watchpoint(2)
def step_inst_for_watchpoint(self, wp_id):
watchpoint_hit = False
current_line = self.frame().GetLineEntry().GetLine()
while self.frame().GetLineEntry().GetLine() == current_line:
self.thread().StepInstruction(False) # step_over=False
stop_reason = self.thread().GetStopReason()
if stop_reason == lldb.eStopReasonWatchpoint:
self.assertFalse(watchpoint_hit, "Watchpoint already hit.")
expected_stop_desc = "watchpoint %d" % wp_id
actual_stop_desc = self.thread().GetStopDescription(20)
self.assertTrue(actual_stop_desc == expected_stop_desc,
"Watchpoint ID didn't match.")
watchpoint_hit = True
else:
self.assertTrue(stop_reason == lldb.eStopReasonPlanComplete,
STOPPED_DUE_TO_STEP_IN)
self.assertTrue(watchpoint_hit, "Watchpoint never hit.")
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