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   1 """
   2 Test lldb watchpoint that uses 'watchpoint set -w write -s size' to watch a pointed location with size.
   3 """
   4
   5 from __future__ import print_function
   6
   7
   8 import lldb
   9 from lldbsuite.test.decorators import *
  10 from lldbsuite.test.lldbtest import *
  11 from lldbsuite.test import lldbutil
  12
  13
  14 class WatchLocationUsingWatchpointSetTestCase(TestBase):
  15
  16     mydir = TestBase.compute_mydir(__file__)
  17
  18     def setUp(self):
  19         # Call super's setUp().
  20         TestBase.setUp(self)
  21         # Our simple source filename.
  22         self.source = 'main.cpp'
  23         # Find the line number to break inside main().
  24         self.line = line_number(
  25             self.source, '// Set break point at this line.')
  26         # This is for verifying that watch location works.
  27         self.violating_func = "do_bad_thing_with_location"
  28         # Build dictionary to have unique executable names for each test
  29         # method.
  30
  31     @expectedFailureAll(
  32         oslist=["linux"],
  33         archs=[
  34             'aarch64',
  35             'arm'],
  36         bugnumber="llvm.org/pr26031")
  37     @expectedFailureAll(
  38         oslist=["windows"],
  39         bugnumber="llvm.org/pr24446: WINDOWS XFAIL TRIAGE - Watchpoints not supported on Windows")
  40     @expectedFailureNetBSD
  41     def test_watchlocation_using_watchpoint_set(self):
  42         """Test watching a location with 'watchpoint set expression -w write -s size' option."""
  43         self.build()
  44         self.setTearDownCleanup()
  45
  46         exe = self.getBuildArtifact("a.out")
  47         self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
  48
  49         # Add a breakpoint to set a watchpoint when stopped on the breakpoint.
  50         lldbutil.run_break_set_by_file_and_line(
  51             self, None, self.line, num_expected_locations=1)
  52
  53         # Run the program.
  54         self.runCmd("run", RUN_SUCCEEDED)
  55
  56         # We should be stopped again due to the breakpoint.
  57         # The stop reason of the thread should be breakpoint.
  58         self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
  59                     substrs=['stopped',
  60                              'stop reason = breakpoint'])
  61
  62         # Now let's set a write-type watchpoint pointed to by 'g_char_ptr' and
  63         # with offset as 7.
  64         # The main.cpp, by design, misbehaves by not following the agreed upon
  65         # protocol of only accessing the allowable index range of [0, 6].
  66         self.expect(
  67             "watchpoint set expression -w write -s 1 -- g_char_ptr + 7",
  68             WATCHPOINT_CREATED,
  69             substrs=[
  70                 'Watchpoint created',
  71                 'size = 1',
  72                 'type = w'])
  73         self.runCmd("expr unsigned val = g_char_ptr[7]; val")
  74         self.expect(self.res.GetOutput().splitlines()[0], exe=False,
  75                     endstr=' = 0')
  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         self.runCmd("process continue")
  83
  84         # We should be stopped again due to the watchpoint (write type), but
  85         # only once.  The stop reason of the thread should be watchpoint.
  86         self.expect("thread list", STOPPED_DUE_TO_WATCHPOINT,
  87                     substrs=['stopped',
  88                              'stop reason = watchpoint',
  89                              self.violating_func])
  90
  91         # Switch to the thread stopped due to watchpoint and issue some
  92         # commands.
  93         self.switch_to_thread_with_stop_reason(lldb.eStopReasonWatchpoint)
  94         self.runCmd("thread backtrace")
  95         self.runCmd("expr unsigned val = g_char_ptr[7]; val")
  96         self.expect(self.res.GetOutput().splitlines()[0], exe=False,
  97                     endstr=' = 99')
  98
  99         # Use the '-v' option to do verbose listing of the watchpoint.
 100         # The hit count should now be the same as the number of threads that
 101         # stopped on a watchpoint.
 102         threads = lldbutil.get_stopped_threads(
 103             self.process(), lldb.eStopReasonWatchpoint)
 104         self.expect("watchpoint list -v",
 105                     substrs=['hit_count = %d' % len(threads)])
 106
 107         self.runCmd("thread backtrace all")