| """ |
| 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__) |
| 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) |
| |
| @skipIfFreeBSD # llvm.org/pr19246: intermittent failure |
| @skipIfDarwin # llvm.org/pr19246: intermittent failure |
| @skipIfWindows # Test relies on signals, unsupported on Windows |
| @expectedFlakeyAndroid(bugnumber="llvm.org/pr19246") |
| 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): |
| (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: |
| 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.") |
