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"""
Test stopping at a breakpoint in an expression, and unwinding from there.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class UnwindFromExpressionTest(TestBase):
main_spec = lldb.SBFileSpec("main.cpp", False)
def build_and_run_to_bkpt(self):
self.build()
(target, process, self.thread, bkpt) = lldbutil.run_to_source_breakpoint(
self, "// Set a breakpoint here to get started", self.main_spec
)
# Next set a breakpoint in this function, set up Expression options to stop on
# breakpoint hits, and call the function.
self.fun_bkpt = self.target().BreakpointCreateBySourceRegex(
"// Stop inside the function here.", self.main_spec
)
self.assertTrue(self.fun_bkpt, VALID_BREAKPOINT)
@no_debug_info_test
@expectedFailureAll(bugnumber="llvm.org/pr33164")
def test_conditional_bktp(self):
"""
Test conditional breakpoint handling in the IgnoreBreakpoints = False case
"""
self.build_and_run_to_bkpt()
self.fun_bkpt.SetCondition("0") # Should not get hit
options = lldb.SBExpressionOptions()
options.SetIgnoreBreakpoints(False)
options.SetUnwindOnError(False)
main_frame = self.thread.GetFrameAtIndex(0)
val = main_frame.EvaluateExpression("second_function(47)", options)
self.assertSuccess(val.GetError(), "We did complete the execution.")
self.assertEqual(47, val.GetValueAsSigned())
@add_test_categories(["pyapi"])
@expectedFlakeyNetBSD
def test_unwind_expression(self):
"""Test unwinding from an expression."""
self.build_and_run_to_bkpt()
# Run test with varying one thread timeouts to also test the halting
# logic in the IgnoreBreakpoints = False case
self.do_unwind_test(self.thread, self.fun_bkpt, 1000)
self.do_unwind_test(self.thread, self.fun_bkpt, 100000)
def do_unwind_test(self, thread, bkpt, timeout):
#
# Use Python API to evaluate expressions while stopped in a stack frame.
#
main_frame = thread.GetFrameAtIndex(0)
options = lldb.SBExpressionOptions()
options.SetIgnoreBreakpoints(False)
options.SetUnwindOnError(False)
options.SetOneThreadTimeoutInMicroSeconds(timeout)
val = main_frame.EvaluateExpression("a_function_to_call()", options)
self.assertTrue(val.GetError().Fail(), "We did not complete the execution.")
error_str = val.GetError().GetCString()
self.assertTrue(
"Execution was interrupted, reason: breakpoint" in error_str,
"And the reason was right.",
)
thread = lldbutil.get_one_thread_stopped_at_breakpoint(self.process(), bkpt)
self.assertTrue(thread.IsValid(), "We are indeed stopped at our breakpoint")
# Now unwind the expression, and make sure we got back to where we
# started.
self.assertSuccess(
thread.UnwindInnermostExpression(), "We succeeded in unwinding"
)
cur_frame = thread.GetFrameAtIndex(0)
self.assertTrue(cur_frame.IsEqual(main_frame), "We got back to the main frame.")
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