LLDB Python API 我怎么知道线程退出了？

Question

我怎么知道

SBThread

是否退出或完成运行代码？

我编写了一个 LLDB 脚本来跟踪程序自启动以来进行的所有 fn 调用。循环应该在最后一次

exit

调用后结束，但实际上，它永远不会结束，并且线程使用无效的程序计数器连续执行。这是我的脚本：

import lldb

def run_program(debugger, command, result, internal_dict):
    target = debugger.GetSelectedTarget()
    print("target is %s"%(target,))
    debugger.SetAsync(False)
    l = lldb.SBLaunchInfo(argv=[])
    error = lldb.SBError()
    l.SetLaunchFlags(lldb.eLaunchFlagStopAtEntry)
    process = target.Launch(l, error)
    thread = process.GetThreadAtIndex(0)
    start_fp = None
    while not thread.is_stopped:
        thread.StepOver()
        frame = thread.get_thread_frames()[-1]
        if not start_fp or start_fp != frame:
            print("%s::"%(frame,))
            start_fp = frame
    return


def __lldb_init_module (debugger, dict):
    #adds a command `rp` (type rp in the lldb prompt)
    #this will execute a python function that keeps stepping until the frame is switched and then print info about the frame
    debugger.HandleCommand('command script add -f %s.run_program rp' % __name__)

lldb --file vector
(lldb) target create "vector"
Current executable set to '/Users/draklor40/gowind-whisper/vector' (arm64).
(lldb) command script import run_program.py
(lldb)

在

exit()

之后我的循环继续运行：

frame #0: 0x00000001006990f0 vector`main(c_argc=0, c_argv=0x0000000000000000, c_envp=0x0000000000000000) at start.zig:501::
frame #1: 0x000000018c51be50 dyld`start + 2544::
{ 79, 79, 79, 79, 79, 79, 79, 79 }
1
frame #0: 0x000000018c56a058 dyld`dyld3::MachOFile::isSimulatorPlatform(dyld3::Platform, dyld3::Platform*)::
frame #0: 0x000000018c51be64 dyld`start + 2564::
frame #0: 0x000000018c85df68 libdyld.dylib`dyld4::LibSystemHelpers::exit(int) const::
frame #1: 0x000000018c51be9c dyld`start + 2620::
::
::
::
::
::
::
::
::

从documentation，它说，

is_stopped

只有在线程停止但没有退出时才为真。我怎么知道线程是否退出？