"""
Test that the debugger handles loops in std::list (which can appear as a result of e.g. memory
corruption).
"""

from __future__ import print_function


import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil


class LibcxxListDataFormatterTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)
    NO_DEBUG_INFO_TESTCASE = True

    @add_test_categories(["libc++"])
    @expectedFailureAndroid(bugnumber="llvm.org/pr32592")
    def test_with_run_command(self):
        self.build()
        exe = self.getBuildArtifact("a.out")
        target = self.dbg.CreateTarget(exe)
        self.assertTrue(target and target.IsValid(), "Target is valid")

        file_spec = lldb.SBFileSpec("main.cpp", False)
        breakpoint1 = target.BreakpointCreateBySourceRegex(
            '// Set break point at this line.', file_spec)
        self.assertTrue(breakpoint1 and breakpoint1.IsValid())
        breakpoint2 = target.BreakpointCreateBySourceRegex(
            '// Set second break point at this line.', file_spec)
        self.assertTrue(breakpoint2 and breakpoint2.IsValid())

        # Run the program, it should stop at breakpoint 1.
        process = target.LaunchSimple(
            None, None, self.get_process_working_directory())
        self.assertTrue(process and process.IsValid(), PROCESS_IS_VALID)
        self.assertEqual(
            len(lldbutil.get_threads_stopped_at_breakpoint(process, breakpoint1)), 1)

        # verify our list is displayed correctly
        self.expect(
            "frame variable *numbers_list",
            substrs=[
                '[0] = 1',
                '[1] = 2',
                '[2] = 3',
                '[3] = 4',
                '[5] = 6'])

        # Continue to breakpoint 2.
        process.Continue()
        self.assertTrue(process and process.IsValid(), PROCESS_IS_VALID)
        self.assertEqual(
            len(lldbutil.get_threads_stopped_at_breakpoint(process, breakpoint2)), 1)

        # The list is now inconsistent. However, we should be able to get the first three
        # elements at least (and most importantly, not crash).
        self.expect(
            "frame variable *numbers_list",
            substrs=[
                '[0] = 1',
                '[1] = 2',
                '[2] = 3'])

        # Run to completion.
        process.Continue()
        self.assertEqual(process.GetState(), lldb.eStateExited, PROCESS_EXITED)
