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"""
Test calling a function that hits a signal set to auto-restart, make sure the call completes.
"""
import unittest2
import lldb
import lldbutil
from lldbtest import *
class ExprCommandWithTimeoutsTestCase(TestBase):
mydir = os.path.join("expression_command", "call-restarts")
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)
@unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
@dsym_test
def test_with_dsym(self):
"""Test calling std::String member function."""
self.buildDsym()
self.call_function()
@skipIfFreeBSD # llvm.org/pr15278
@skipIfLinux # llvm.org/pr15278: handle expressions that generate signals on Linux
@dwarf_test
def test_with_dwarf(self):
"""Test calling std::String member function."""
self.buildDwarf()
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):
"""Test calling function with timeout."""
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, os.getcwd())
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() == True, "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()
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() == True)
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() == True)
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() == True, "Set SIGCHLD to pass, no-stop, notify")
value = frame.EvaluateExpression("call_me (%d)"%(num_sigchld), options)
self.assertTrue (value.IsValid() and value.GetError().Success() == True)
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() == True)
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() == True, "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() == True, "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.")
if __name__ == '__main__':
import atexit
lldb.SBDebugger.Initialize()
atexit.register(lambda: lldb.SBDebugger.Terminate())
unittest2.main()
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