lldb/test/API/functionalities/thread/create_after_attach/TestCreateAfterAttach.py

"""
Test thread creation after process attach.
"""


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


@requireThreadSupport
class CreateAfterAttachTestCase(TestBase):
    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line numbers for our breakpoints.
        self.break_1 = line_number("main.cpp", "// Set first breakpoint here")
        self.break_2 = line_number("main.cpp", "// Set second breakpoint here")
        self.break_3 = line_number("main.cpp", "// Set third breakpoint here")

    # Occasionally hangs on Windows, may be same as other issues.
    @skipIfWindows
    @skipIfiOSSimulator
    @expectedFailureNetBSD
    def test_create_after_attach(self):
        """Test thread creation after process attach."""
        self.build()
        exe = self.getBuildArtifact("a.out")

        # Spawn a new process
        # use realpath to workaround llvm.org/pr48376
        popen = self.spawnSubprocess(os.path.realpath(exe))
        pid = popen.pid

        # Attach to the spawned process
        self.runCmd("process attach -p " + str(pid))

        target = self.dbg.GetSelectedTarget()

        process = target.GetProcess()
        self.assertTrue(process, PROCESS_IS_VALID)

        # This should create a breakpoint in the main thread.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.cpp", self.break_1, num_expected_locations=1
        )

        # This should create a breakpoint in the second child thread.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.cpp", self.break_2, num_expected_locations=1
        )

        # This should create a breakpoint in the first child thread.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.cpp", self.break_3, num_expected_locations=1
        )

        # Note:  With std::thread, we cannot rely on particular thread numbers.  Using
        # std::thread may cause the program to spin up a thread pool (and it does on
        # Windows), so the thread numbers are non-deterministic.

        # Run to the first breakpoint
        self.runCmd("continue")

        # The stop reason of the thread should be breakpoint.
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=["stopped", "* thread #", "main", "stop reason = breakpoint"],
        )

        # Change a variable to escape the loop
        self.runCmd("expression main_thread_continue = 1")

        # Run to the second breakpoint
        self.runCmd("continue")

        # The stop reason of the thread should be breakpoint.
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=[
                "stopped",
                "* thread #",
                "thread_2_func",
                "stop reason = breakpoint",
            ],
        )

        # Change a variable to escape the loop
        self.runCmd("expression child_thread_continue = 1")

        # Run to the third breakpoint
        self.runCmd("continue")

        # The stop reason of the thread should be breakpoint.
        # Thread 3 may or may not have already exited.
        self.expect(
            "thread list",
            STOPPED_DUE_TO_BREAKPOINT,
            substrs=[
                "stopped",
                "* thread #",
                "thread_1_func",
                "stop reason = breakpoint",
            ],
        )

        # Run to completion
        self.runCmd("continue")

        # At this point, the inferior process should have exited.
        self.assertEqual(process.GetState(), lldb.eStateExited, PROCESS_EXITED)