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      1 """
      2 Use lldb Python SBValue API to create a watchpoint for read_write of 'globl' var.
      3 """
      4 
      5 import os, time
      6 import re
      7 import unittest2
      8 import lldb, lldbutil
      9 from lldbtest import *
     10 
     11 class SetWatchpointAPITestCase(TestBase):
     12 
     13     mydir = os.path.join("python_api", "watchpoint")
     14 
     15     def setUp(self):
     16         # Call super's setUp().
     17         TestBase.setUp(self)
     18         # Our simple source filename.
     19         self.source = 'main.c'
     20         # Find the line number to break inside main().
     21         self.line = line_number(self.source, '// Set break point at this line.')
     22 
     23     @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
     24     @python_api_test
     25     @dsym_test
     26     def test_watch_val_with_dsym(self):
     27         """Exercise SBValue.Watch() API to set a watchpoint."""
     28         self.buildDsym()
     29         self.do_set_watchpoint()
     30 
     31     @expectedFailureFreeBSD('llvm.org/pr16706') # Watchpoints fail on FreeBSD
     32     @python_api_test
     33     @dwarf_test
     34     def test_watch_val_with_dwarf(self):
     35         """Exercise SBValue.Watch() API to set a watchpoint."""
     36         self.buildDwarf()
     37         self.do_set_watchpoint()
     38 
     39     def do_set_watchpoint(self):
     40         """Use SBFrame.WatchValue() to set a watchpoint and verify that the program stops later due to the watchpoint."""
     41         exe = os.path.join(os.getcwd(), "a.out")
     42 
     43         # Create a target by the debugger.
     44         target = self.dbg.CreateTarget(exe)
     45         self.assertTrue(target, VALID_TARGET)
     46 
     47         # Now create a breakpoint on main.c.
     48         breakpoint = target.BreakpointCreateByLocation(self.source, self.line)
     49         self.assertTrue(breakpoint and
     50                         breakpoint.GetNumLocations() == 1,
     51                         VALID_BREAKPOINT)
     52 
     53         # Now launch the process, and do not stop at the entry point.
     54         process = target.LaunchSimple(None, None, os.getcwd())
     55 
     56         # We should be stopped due to the breakpoint.  Get frame #0.
     57         process = target.GetProcess()
     58         self.assertTrue(process.GetState() == lldb.eStateStopped,
     59                         PROCESS_STOPPED)
     60         thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
     61         frame0 = thread.GetFrameAtIndex(0)
     62 
     63         # Watch 'global' for read and write.
     64         value = frame0.FindValue('global', lldb.eValueTypeVariableGlobal)
     65         error = lldb.SBError();
     66         watchpoint = value.Watch(True, True, True, error)
     67         self.assertTrue(value and watchpoint,
     68                         "Successfully found the variable and set a watchpoint")
     69         self.DebugSBValue(value)
     70 
     71         # Hide stdout if not running with '-t' option.
     72         if not self.TraceOn():
     73             self.HideStdout()
     74 
     75         print watchpoint
     76 
     77         # Continue.  Expect the program to stop due to the variable being written to.
     78         process.Continue()
     79 
     80         if (self.TraceOn()):
     81             lldbutil.print_stacktraces(process)
     82 
     83         thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonWatchpoint)
     84         self.assertTrue(thread, "The thread stopped due to watchpoint")
     85         self.DebugSBValue(value)
     86 
     87         # Continue.  Expect the program to stop due to the variable being read from.
     88         process.Continue()
     89 
     90         if (self.TraceOn()):
     91             lldbutil.print_stacktraces(process)
     92 
     93         thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonWatchpoint)
     94         self.assertTrue(thread, "The thread stopped due to watchpoint")
     95         self.DebugSBValue(value)
     96 
     97         # Continue the process.  We don't expect the program to be stopped again.
     98         process.Continue()
     99 
    100         # At this point, the inferior process should have exited.
    101         self.assertTrue(process.GetState() == lldb.eStateExited, PROCESS_EXITED)
    102 
    103 
    104 if __name__ == '__main__':
    105     import atexit
    106     lldb.SBDebugger.Initialize()
    107     atexit.register(lambda: lldb.SBDebugger.Terminate())
    108     unittest2.main()
    109