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