artulab.com Git - openbsd/blob

   1 """
   2 Use lldb Python SBValue.WatchPointee() API to create a watchpoint for write of '*g_char_ptr'.
   3 """
   4
   5 from __future__ import print_function
   6
   7
   8
   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 SetWatchlocationAPITestCase(TestBase):
  16
  17     mydir = TestBase.compute_mydir(__file__)
  18     NO_DEBUG_INFO_TESTCASE = True
  19
  20     def setUp(self):
  21         # Call super's setUp().
  22         TestBase.setUp(self)
  23         # Our simple source filename.
  24         self.source = 'main.cpp'
  25         # Find the line number to break inside main().
  26         self.line = line_number(
  27             self.source, '// Set break point at this line.')
  28         # This is for verifying that watch location works.
  29         self.violating_func = "do_bad_thing_with_location"
  30
  31     @add_test_categories(['pyapi'])
  32     def test_watch_location(self):
  33         """Exercise SBValue.WatchPointee() API to set a watchpoint."""
  34         self.build()
  35         exe = self.getBuildArtifact("a.out")
  36
  37         # Create a target by the debugger.
  38         target = self.dbg.CreateTarget(exe)
  39         self.assertTrue(target, VALID_TARGET)
  40
  41         # Now create a breakpoint on main.c.
  42         breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
  43         self.assertTrue(breakpoint and
  44                         breakpoint.GetNumLocations() == 1,
  45                         VALID_BREAKPOINT)
  46
  47         # Now launch the process, and do not stop at the entry point.
  48         process = target.LaunchSimple(
  49             None, None, self.get_process_working_directory())
  50
  51         # We should be stopped due to the breakpoint.  Get frame #0.
  52         process = target.GetProcess()
  53         self.assertTrue(process.GetState() == lldb.eStateStopped,
  54                         PROCESS_STOPPED)
  55         thread = lldbutil.get_stopped_thread(
  56             process, lldb.eStopReasonBreakpoint)
  57         frame0 = thread.GetFrameAtIndex(0)
  58
  59         value = frame0.FindValue('g_char_ptr',
  60                                  lldb.eValueTypeVariableGlobal)
  61         pointee = value.CreateValueFromAddress(
  62             "pointee",
  63             value.GetValueAsUnsigned(0),
  64             value.GetType().GetPointeeType())
  65         # Watch for write to *g_char_ptr.
  66         error = lldb.SBError()
  67         watchpoint = value.WatchPointee(True, False, True, error)
  68         self.assertTrue(value and watchpoint,
  69                         "Successfully found the pointer and set a watchpoint")
  70         self.DebugSBValue(value)
  71         self.DebugSBValue(pointee)
  72
  73         # Hide stdout if not running with '-t' option.
  74         if not self.TraceOn():
  75             self.HideStdout()
  76
  77         print(watchpoint)
  78
  79         # Continue.  Expect the program to stop due to the variable being
  80         # written to.
  81         process.Continue()
  82
  83         if (self.TraceOn()):
  84             lldbutil.print_stacktraces(process)
  85
  86         thread = lldbutil.get_stopped_thread(
  87             process, lldb.eStopReasonWatchpoint)
  88         self.assertTrue(thread, "The thread stopped due to watchpoint")
  89         self.DebugSBValue(value)
  90         self.DebugSBValue(pointee)
  91
  92         self.expect(
  93             lldbutil.print_stacktrace(
  94                 thread,
  95                 string_buffer=True),
  96             exe=False,
  97             substrs=[
  98                 self.violating_func])
  99
 100         # This finishes our test.