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"""
Test stopping at a breakpoint in an expression, and unwinding from there.
"""
from __future__ import print_function
import unittest2
import os
import time
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class UnwindFromExpressionTest(TestBase):
mydir = TestBase.compute_mydir(__file__)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
@add_test_categories(['pyapi'])
@expectedFailureAll(oslist=["windows"])
def test_unwind_expression(self):
"""Test unwinding from an expression."""
self.build()
exe = os.path.join(os.getcwd(), "a.out")
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Create the breakpoint.
main_spec = lldb.SBFileSpec("main.cpp", False)
breakpoint = target.BreakpointCreateBySourceRegex(
"// Set a breakpoint here to get started", main_spec)
self.assertTrue(breakpoint, VALID_BREAKPOINT)
# Launch the process, and do not stop at the entry point.
process = target.LaunchSimple(
None, None, self.get_process_working_directory())
if not process:
self.fail("SBTarget.LaunchProcess() failed")
if process.GetState() != lldb.eStateStopped:
self.fail("Process should be in the 'stopped' state, "
"instead the actual state is: '%s'" %
lldbutil.state_type_to_str(process.GetState()))
thread = lldbutil.get_one_thread_stopped_at_breakpoint(
process, breakpoint)
self.assertIsNotNone(
thread, "Expected one thread to be stopped at the breakpoint")
#
# Use Python API to evaluate expressions while stopped in a stack frame.
#
main_frame = thread.GetFrameAtIndex(0)
# Next set a breakpoint in this function, set up Expression options to stop on
# breakpoint hits, and call the function.
fun_bkpt = target.BreakpointCreateBySourceRegex(
"// Stop inside the function here.", main_spec)
self.assertTrue(fun_bkpt, VALID_BREAKPOINT)
options = lldb.SBExpressionOptions()
options.SetIgnoreBreakpoints(False)
options.SetUnwindOnError(False)
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(
process, fun_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.
error = thread.UnwindInnermostExpression()
self.assertTrue(error.Success(), "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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