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"""
Test calling a function that hits a signal set to auto-restart, make sure the call completes.
"""
from __future__ import print_function
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class ExprCommandThatRestartsTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
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)
@skipIfFreeBSD # llvm.org/pr19246: intermittent failure
@skipIfDarwin # llvm.org/pr19246: intermittent failure
@skipIfWindows # Test relies on signals, unsupported on Windows
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.assertTrue(
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.assertTrue(
self.orig_frame_pc == frame.GetPC(),
"Restored the zeroth frame correctly")
def call_function(self):
exe_name = "a.out"
exe = os.path.join(os.getcwd(), exe_name)
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
empty = lldb.SBFileSpec()
breakpoint = target.BreakpointCreateBySourceRegex(
'Stop here in main.', self.main_source_spec)
self.assertTrue(breakpoint.GetNumLocations() > 0, VALID_BREAKPOINT)
# Launch the process, and do not stop at the entry point.
process = target.LaunchSimple(
None, None, self.get_process_working_directory())
self.assertTrue(process, PROCESS_IS_VALID)
# Frame #0 should be at our breakpoint.
threads = lldbutil.get_threads_stopped_at_breakpoint(
process, breakpoint)
self.assertTrue(len(threads) == 1)
self.thread = threads[0]
# Make sure the SIGCHLD behavior is pass/no-stop/no-notify:
return_obj = lldb.SBCommandReturnObject()
self.dbg.GetCommandInterpreter().HandleCommand(
"process handle SIGCHLD -s 0 -p 1 -n 0", return_obj)
self.assertTrue(return_obj.Succeeded(), "Set SIGCHLD to pass, no-stop")
# 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.assertTrue(
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.assertTrue(value.GetError().Success())
self.assertTrue(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() and value.GetError().Success())
self.assertTrue(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.dbg.GetCommandInterpreter().HandleCommand(
"process handle SIGCHLD -s 0 -p 1 -n 1", return_obj)
self.assertTrue(
return_obj.Succeeded(),
"Set SIGCHLD to pass, no-stop, notify")
value = frame.EvaluateExpression(
"call_me (%d)" %
(num_sigchld), options)
self.assertTrue(value.IsValid() and value.GetError().Success())
self.assertTrue(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() and value.GetError().Success())
self.assertTrue(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.dbg.GetCommandInterpreter().HandleCommand(
"process handle SIGCHLD -s 1 -p 1 -n 1", return_obj)
self.assertTrue(
return_obj.Succeeded(),
"Set SIGCHLD to pass, stop, notify")
value = frame.EvaluateExpression(
"call_me (%d)" %
(num_sigchld), options)
self.assertTrue(
value.IsValid() and value.GetError().Success() == False)
# Set signal handling back to no-stop, and continue and we should end
# up back in out starting frame:
self.dbg.GetCommandInterpreter().HandleCommand(
"process handle SIGCHLD -s 0 -p 1 -n 1", return_obj)
self.assertTrue(
return_obj.Succeeded(),
"Set SIGCHLD to pass, no-stop, notify")
error = process.Continue()
self.assertTrue(
error.Success(),
"Continuing after stopping for signal succeeds.")
frame = self.thread.GetFrameAtIndex(0)
self.assertTrue(
frame.GetPC() == self.orig_frame_pc,
"Continuing returned to the place we started.")
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