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"""
Test calling a function that hits a signal set to auto-restart, make sure the call completes.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class ExprCommandThatRestartsTestCase(TestBase):
NO_DEBUG_INFO_TESTCASE = True
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
self.main_source = "lotta-signals.c"
self.main_source_spec = lldb.SBFileSpec(self.main_source)
@skipIfDarwin # llvm.org/pr19246: intermittent failure
@skipIfWindows # Test relies on signals, unsupported on Windows
@expectedFlakeyAndroid(bugnumber="llvm.org/pr19246")
@expectedFlakeyNetBSD
def test(self):
"""Test calling function that hits a signal and restarts."""
self.build()
self.call_function()
def check_after_call(self, num_sigchld):
after_call = self.sigchld_no.GetValueAsSigned(-1)
self.assertEqual(
after_call - self.start_sigchld_no,
num_sigchld,
"Really got %d SIGCHLD signals through the call." % (num_sigchld),
)
self.start_sigchld_no = after_call
# Check that we are back where we were before:
frame = self.thread.GetFrameAtIndex(0)
self.assertEqual(
self.orig_frame_pc, frame.GetPC(), "Restored the zeroth frame correctly"
)
def call_function(self):
(target, process, self.thread, bkpt) = lldbutil.run_to_source_breakpoint(
self, "Stop here in main.", self.main_source_spec
)
# Make sure the SIGCHLD behavior is pass/no-stop/no-notify:
self.runCmd("process handle SIGCHLD -s 0 -p 1 -n 0")
# The sigchld_no variable should be 0 at this point.
self.sigchld_no = target.FindFirstGlobalVariable("sigchld_no")
self.assertTrue(self.sigchld_no.IsValid(), "Got a value for sigchld_no")
self.start_sigchld_no = self.sigchld_no.GetValueAsSigned(-1)
self.assertNotEqual(
self.start_sigchld_no, -1, "Got an actual value for sigchld_no"
)
options = lldb.SBExpressionOptions()
# processing 30 signals takes a while, increase the expression timeout
# a bit
options.SetTimeoutInMicroSeconds(3000000) # 3s
options.SetUnwindOnError(True)
frame = self.thread.GetFrameAtIndex(0)
# Store away the PC to check that the functions unwind to the right
# place after calls
self.orig_frame_pc = frame.GetPC()
num_sigchld = 30
value = frame.EvaluateExpression("call_me (%d)" % (num_sigchld), options)
self.assertTrue(value.IsValid())
self.assertSuccess(value.GetError())
self.assertEqual(value.GetValueAsSigned(-1), num_sigchld)
self.check_after_call(num_sigchld)
# Okay, now try with a breakpoint in the called code in the case where
# we are ignoring breakpoint hits.
handler_bkpt = target.BreakpointCreateBySourceRegex(
"Got sigchld %d.", self.main_source_spec
)
self.assertTrue(handler_bkpt.GetNumLocations() > 0)
options.SetIgnoreBreakpoints(True)
options.SetUnwindOnError(True)
value = frame.EvaluateExpression("call_me (%d)" % (num_sigchld), options)
self.assertTrue(value.IsValid())
self.assertSuccess(value.GetError())
self.assertEqual(value.GetValueAsSigned(-1), num_sigchld)
self.check_after_call(num_sigchld)
# Now set the signal to print but not stop and make sure that calling
# still works:
self.runCmd("process handle SIGCHLD -s 0 -p 1 -n 1")
value = frame.EvaluateExpression("call_me (%d)" % (num_sigchld), options)
self.assertTrue(value.IsValid())
self.assertSuccess(value.GetError())
self.assertEqual(value.GetValueAsSigned(-1), num_sigchld)
self.check_after_call(num_sigchld)
# Now set this unwind on error to false, and make sure that we still
# complete the call:
options.SetUnwindOnError(False)
value = frame.EvaluateExpression("call_me (%d)" % (num_sigchld), options)
self.assertTrue(value.IsValid())
self.assertSuccess(value.GetError())
self.assertEqual(value.GetValueAsSigned(-1), num_sigchld)
self.check_after_call(num_sigchld)
# Okay, now set UnwindOnError to true, and then make the signal behavior to stop
# and see that now we do stop at the signal point:
self.runCmd("process handle SIGCHLD -s 1 -p 1 -n 1")
value = frame.EvaluateExpression("call_me (%d)" % (num_sigchld), options)
self.assertTrue(value.IsValid())
self.assertFalse(value.GetError().Success())
# Set signal handling back to no-stop, and continue and we should end
# up back in out starting frame:
self.runCmd("process handle SIGCHLD -s 0 -p 1 -n 1")
error = process.Continue()
self.assertSuccess(error, "Continuing after stopping for signal succeeds.")
frame = self.thread.GetFrameAtIndex(0)
self.assertEqual(
frame.GetPC(),
self.orig_frame_pc,
"Continuing returned to the place we started.",
)
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