lldb/test/API/lang/objc/print-obj/TestPrintObj.py

   1 """
   2 Test "print object" where another thread blocks the print object from making progress.
   3 """
   4
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test import lldbutil
   9
  10
  11 class PrintObjTestCase(TestBase):
  12     def setUp(self):
  13         # Call super's setUp().
  14         TestBase.setUp(self)
  15         # My source program.
  16         self.source = "blocked.m"
  17         # Find the line numbers to break at.
  18         self.line = line_number(self.source, "// Set a breakpoint here.")
  19
  20     def test_print_obj(self):
  21         """
  22         Test "print object" where another thread blocks the print object from making progress.
  23
  24         Set a breakpoint on the line in my_pthread_routine.  Then switch threads
  25         to the main thread, and do print the lock_me object.  Since that will
  26         try to get the lock already gotten by my_pthread_routime thread, it will
  27         have to switch to running all threads, and that should then succeed.
  28         """
  29         d = {"EXE": "b.out"}
  30         self.build(dictionary=d)
  31         self.setTearDownCleanup(dictionary=d)
  32         exe = self.getBuildArtifact("b.out")
  33
  34         target = self.dbg.CreateTarget(exe)
  35         self.assertTrue(target, VALID_TARGET)
  36
  37         breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
  38         self.assertTrue(breakpoint, VALID_BREAKPOINT)
  39         self.runCmd("breakpoint list")
  40
  41         # Launch the process, and do not stop at the entry point.
  42         process = target.LaunchSimple(None, None, self.get_process_working_directory())
  43
  44         self.runCmd("thread backtrace all")
  45
  46         # Let's get the current stopped thread.  We'd like to switch to the
  47         # other thread to issue our 'po lock_me' command.
  48         import lldbsuite.test.lldbutil as lldbutil
  49
  50         this_thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
  51         self.assertTrue(this_thread)
  52
  53         # Find the other thread.  The iteration protocol of SBProcess and the
  54         # rich comparison methods (__eq__/__ne__) of SBThread come in handy.
  55         other_thread = None
  56         for t in process:
  57             if t != this_thread:
  58                 other_thread = t
  59                 break
  60
  61         # Set the other thread as the selected thread to issue our 'po'
  62         # command.other
  63         self.assertTrue(other_thread)
  64         process.SetSelectedThread(other_thread)
  65         if self.TraceOn():
  66             print("selected thread:" + lldbutil.get_description(other_thread))
  67         self.runCmd("thread backtrace")
  68
  69         # We want to traverse the frame to the one corresponding to blocked.m to
  70         # issue our 'po lock_me' command.
  71
  72         depth = other_thread.GetNumFrames()
  73         for i in range(depth):
  74             frame = other_thread.GetFrameAtIndex(i)
  75             name = frame.GetFunctionName()
  76             if name == "main":
  77                 other_thread.SetSelectedFrame(i)
  78                 if self.TraceOn():
  79                     print("selected frame:" + lldbutil.get_description(frame))
  80                 break
  81
  82         self.expect(
  83             "po lock_me", OBJECT_PRINTED_CORRECTLY, substrs=["I am pretty special."]
  84         )