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   1 """
   2 Test that lldb watchpoint works for multiple threads.
   3 """
   4
   5 from __future__ import print_function
   6
   7
   8 import re
   9 import lldb
  10 from lldbsuite.test.decorators import *
  11 from lldbsuite.test.lldbtest import *
  12 from lldbsuite.test import lldbutil
  13
  14
  15 class WatchpointForMultipleThreadsTestCase(TestBase):
  16
  17     mydir = TestBase.compute_mydir(__file__)
  18     NO_DEBUG_INFO_TESTCASE = True
  19     main_spec = lldb.SBFileSpec("main.cpp", False)
  20
  21     def test_watchpoint_before_thread_start(self):
  22         """Test that we can hit a watchpoint we set before starting another thread"""
  23         self.do_watchpoint_test("Before running the thread")
  24
  25     def test_watchpoint_after_thread_start(self):
  26         """Test that we can hit a watchpoint we set after starting another thread"""
  27         self.do_watchpoint_test("After running the thread")
  28
  29     def do_watchpoint_test(self, line):
  30         self.build()
  31         lldbutil.run_to_source_breakpoint(self, line, self.main_spec)
  32
  33         # Now let's set a write-type watchpoint for variable 'g_val'.
  34         self.expect(
  35             "watchpoint set variable -w write g_val",
  36             WATCHPOINT_CREATED,
  37             substrs=[
  38                 'Watchpoint created',
  39                 'size = 4',
  40                 'type = w'])
  41
  42         # Use the '-v' option to do verbose listing of the watchpoint.
  43         # The hit count should be 0 initially.
  44         self.expect("watchpoint list -v",
  45                     substrs=['hit_count = 0'])
  46
  47         self.runCmd("process continue")
  48
  49         self.runCmd("thread list")
  50         if "stop reason = watchpoint" in self.res.GetOutput():
  51             # Good, we verified that the watchpoint works!
  52             self.runCmd("thread backtrace all")
  53         else:
  54             self.fail("The stop reason should be either break or watchpoint")
  55
  56         # Use the '-v' option to do verbose listing of the watchpoint.
  57         # The hit count should now be 1.
  58         self.expect("watchpoint list -v",
  59                     substrs=['hit_count = 1'])
  60
  61     def test_watchpoint_multiple_threads_wp_set_and_then_delete(self):
  62         """Test that lldb watchpoint works for multiple threads, and after the watchpoint is deleted, the watchpoint event should no longer fires."""
  63         self.build()
  64         self.setTearDownCleanup()
  65
  66         lldbutil.run_to_source_breakpoint(self, "After running the thread", self.main_spec)
  67
  68         # Now let's set a write-type watchpoint for variable 'g_val'.
  69         self.expect(
  70             "watchpoint set variable -w write g_val",
  71             WATCHPOINT_CREATED,
  72             substrs=[
  73                 'Watchpoint created',
  74                 'size = 4',
  75                 'type = w'])
  76
  77         # Use the '-v' option to do verbose listing of the watchpoint.
  78         # The hit count should be 0 initially.
  79         self.expect("watchpoint list -v",
  80                     substrs=['hit_count = 0'])
  81
  82         watchpoint_stops = 0
  83         while True:
  84             self.runCmd("process continue")
  85             self.runCmd("process status")
  86             if re.search("Process .* exited", self.res.GetOutput()):
  87                 # Great, we are done with this test!
  88                 break
  89
  90             self.runCmd("thread list")
  91             if "stop reason = watchpoint" in self.res.GetOutput():
  92                 self.runCmd("thread backtrace all")
  93                 watchpoint_stops += 1
  94                 if watchpoint_stops > 1:
  95                     self.fail(
  96                         "Watchpoint hits not supposed to exceed 1 by design!")
  97                 # Good, we verified that the watchpoint works!  Now delete the
  98                 # watchpoint.
  99                 if self.TraceOn():
 100                     print(
 101                         "watchpoint_stops=%d at the moment we delete the watchpoint" %
 102                         watchpoint_stops)
 103                 self.runCmd("watchpoint delete 1")
 104                 self.expect("watchpoint list -v",
 105                             substrs=['No watchpoints currently set.'])
 106                 continue
 107             else:
 108                 self.fail("The stop reason should be either break or watchpoint")