140 lines
6.2 KiB
Python
140 lines
6.2 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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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.lldbtest import *
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class ExprCommandThatRestartsTestCase(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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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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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 (after_call - self.start_sigchld_no == num_sigchld, "Really got %d SIGCHLD signals through the call."%(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 (self.orig_frame_pc == frame.GetPC(), "Restored the zeroth frame correctly")
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def call_function(self):
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exe_name = "a.out"
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exe = os.path.join(os.getcwd(), exe_name)
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target = self.dbg.CreateTarget(exe)
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self.assertTrue(target, VALID_TARGET)
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empty = lldb.SBFileSpec()
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breakpoint = target.BreakpointCreateBySourceRegex('Stop here in main.',self.main_source_spec)
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self.assertTrue(breakpoint.GetNumLocations() > 0, VALID_BREAKPOINT)
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# Launch the process, and do not stop at the entry point.
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process = target.LaunchSimple (None, None, self.get_process_working_directory())
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self.assertTrue(process, PROCESS_IS_VALID)
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# Frame #0 should be at our breakpoint.
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threads = lldbutil.get_threads_stopped_at_breakpoint (process, breakpoint)
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self.assertTrue(len(threads) == 1)
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self.thread = threads[0]
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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("process handle SIGCHLD -s 0 -p 1 -n 0", return_obj)
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self.assertTrue (return_obj.Succeeded() == True, "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 (self.sigchld_no.IsValid(), "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 (self.start_sigchld_no != -1, "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 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 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 ("call_me (%d)"%(num_sigchld), options)
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self.assertTrue (value.IsValid())
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self.assertTrue (value.GetError().Success() == True)
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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("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("call_me (%d)"%(num_sigchld), options)
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self.assertTrue (value.IsValid() and value.GetError().Success() == True)
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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 still works:
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self.dbg.GetCommandInterpreter().HandleCommand("process handle SIGCHLD -s 0 -p 1 -n 1", return_obj)
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self.assertTrue (return_obj.Succeeded() == True, "Set SIGCHLD to pass, no-stop, notify")
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value = frame.EvaluateExpression("call_me (%d)"%(num_sigchld), options)
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self.assertTrue (value.IsValid() and value.GetError().Success() == True)
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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 complete the call:
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options.SetUnwindOnError(False)
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value = frame.EvaluateExpression("call_me (%d)"%(num_sigchld), options)
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self.assertTrue (value.IsValid() and value.GetError().Success() == True)
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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("process handle SIGCHLD -s 1 -p 1 -n 1", return_obj)
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self.assertTrue (return_obj.Succeeded() == True, "Set SIGCHLD to pass, stop, notify")
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value = frame.EvaluateExpression("call_me (%d)"%(num_sigchld), options)
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self.assertTrue (value.IsValid() and value.GetError().Success() == False)
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# Set signal handling back to no-stop, and continue and we should end up back in out starting frame:
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self.dbg.GetCommandInterpreter().HandleCommand("process handle SIGCHLD -s 0 -p 1 -n 1", return_obj)
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self.assertTrue (return_obj.Succeeded() == True, "Set SIGCHLD to pass, no-stop, notify")
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error = process.Continue()
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self.assertTrue (error.Success(), "Continuing after stopping for signal succeeds.")
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frame = self.thread.GetFrameAtIndex(0)
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self.assertTrue (frame.GetPC() == self.orig_frame_pc, "Continuing returned to the place we started.")
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