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   1 """Test that lldb functions correctly after the inferior has crashed while in a recursive routine."""
   2
   3
   4
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test import lldbplatformutil
   9 from lldbsuite.test import lldbutil
  10
  11
  12 class CrashingRecursiveInferiorTestCase(TestBase):
  13
  14     mydir = TestBase.compute_mydir(__file__)
  15
  16     @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
  17     @expectedFailureNetBSD
  18     def test_recursive_inferior_crashing(self):
  19         """Test that lldb reliably catches the inferior crashing (command)."""
  20         self.build()
  21         self.recursive_inferior_crashing()
  22
  23     @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
  24     def test_recursive_inferior_crashing_register(self):
  25         """Test that lldb reliably reads registers from the inferior after crashing (command)."""
  26         self.build()
  27         self.recursive_inferior_crashing_registers()
  28
  29     @add_test_categories(['pyapi'])
  30     def test_recursive_inferior_crashing_python(self):
  31         """Test that lldb reliably catches the inferior crashing (Python API)."""
  32         self.build()
  33         self.recursive_inferior_crashing_python()
  34
  35     def test_recursive_inferior_crashing_expr(self):
  36         """Test that the lldb expression interpreter can read from the inferior after crashing (command)."""
  37         self.build()
  38         self.recursive_inferior_crashing_expr()
  39
  40     def set_breakpoint(self, line):
  41         lldbutil.run_break_set_by_file_and_line(
  42             self, "main.c", line, num_expected_locations=1, loc_exact=True)
  43
  44     def check_stop_reason(self):
  45         # We should have one crashing thread
  46         self.assertEqual(
  47             len(lldbutil.get_crashed_threads(self, self.dbg.GetSelectedTarget().GetProcess())),
  48             1,
  49             STOPPED_DUE_TO_EXC_BAD_ACCESS)
  50
  51     def setUp(self):
  52         # Call super's setUp().
  53         TestBase.setUp(self)
  54         # Find the line number of the crash.
  55         self.line = line_number('main.c', '// Crash here.')
  56
  57     def recursive_inferior_crashing(self):
  58         """Inferior crashes upon launching; lldb should catch the event and stop."""
  59         exe = self.getBuildArtifact("a.out")
  60         self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
  61
  62         self.runCmd("run", RUN_SUCCEEDED)
  63
  64         # The exact stop reason depends on the platform
  65         if self.platformIsDarwin():
  66             stop_reason = 'stop reason = EXC_BAD_ACCESS'
  67         elif self.getPlatform() == "linux" or self.getPlatform() == "freebsd":
  68             stop_reason = 'stop reason = signal SIGSEGV'
  69         else:
  70             stop_reason = 'stop reason = invalid address'
  71         self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
  72                     substrs=['stopped',
  73                              stop_reason])
  74
  75         # And it should report a backtrace that includes main and the crash
  76         # site.
  77         self.expect(
  78             "thread backtrace all",
  79             substrs=[
  80                 stop_reason,
  81                 'main',
  82                 'argc',
  83                 'argv',
  84                 'recursive_function'])
  85
  86         # And it should report the correct line number.
  87         self.expect("thread backtrace all",
  88                     substrs=[stop_reason,
  89                              'main.c:%d' % self.line])
  90
  91     def recursive_inferior_crashing_python(self):
  92         """Inferior crashes upon launching; lldb should catch the event and stop."""
  93         exe = self.getBuildArtifact("a.out")
  94
  95         target = self.dbg.CreateTarget(exe)
  96         self.assertTrue(target, VALID_TARGET)
  97
  98         # Now launch the process, and do not stop at entry point.
  99         # Both argv and envp are null.
 100         process = target.LaunchSimple(
 101             None, None, self.get_process_working_directory())
 102
 103         if process.GetState() != lldb.eStateStopped:
 104             self.fail("Process should be in the 'stopped' state, "
 105                       "instead the actual state is: '%s'" %
 106                       lldbutil.state_type_to_str(process.GetState()))
 107
 108         threads = lldbutil.get_crashed_threads(self, process)
 109         self.assertEqual(
 110             len(threads),
 111             1,
 112             "Failed to stop the thread upon bad access exception")
 113
 114         if self.TraceOn():
 115             lldbutil.print_stacktrace(threads[0])
 116
 117     def recursive_inferior_crashing_registers(self):
 118         """Test that lldb can read registers after crashing."""
 119         exe = self.getBuildArtifact("a.out")
 120         self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
 121
 122         self.runCmd("run", RUN_SUCCEEDED)
 123         self.check_stop_reason()
 124
 125         # lldb should be able to read from registers from the inferior after
 126         # crashing.
 127         lldbplatformutil.check_first_register_readable(self)
 128
 129     def recursive_inferior_crashing_expr(self):
 130         """Test that the lldb expression interpreter can read symbols after crashing."""
 131         exe = self.getBuildArtifact("a.out")
 132         self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
 133
 134         self.runCmd("run", RUN_SUCCEEDED)
 135         self.check_stop_reason()
 136
 137         # The lldb expression interpreter should be able to read from addresses
 138         # of the inferior after a crash.
 139         self.expect("p i",
 140                     startstr='(int) $0 =')
 141