TestInferiorCrashing.py revision 92e33e925aeae87b3f91d8ec6ca585a6d9e13bfb 
1"""Test that lldb functions correctly after the inferior has crashed."""
2
3import os, time
4import unittest2
5import lldb, lldbutil
6from lldbtest import *
7
8class CrashingInferiorTestCase(TestBase):
9
10    mydir = os.path.join("functionalities", "inferior-crashing")
11
12    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
13    def test_inferior_crashing_dsym(self):
14        """Test that lldb reliably catches the inferior crashing (command)."""
15        self.buildDsym()
16        self.inferior_crashing()
17
18    def test_inferior_crashing_dwarf(self):
19        """Test that lldb reliably catches the inferior crashing (command)."""
20        self.buildDwarf()
21        self.inferior_crashing()
22
23    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
24    def test_inferior_crashing_registers_dsym(self):
25        """Test that lldb reliably reads registers from the inferior after crashing (command)."""
26        self.buildDsym()
27        self.inferior_crashing_registers()
28
29    def test_inferior_crashing_register_dwarf(self):
30        """Test that lldb reliably reads registers from the inferior after crashing (command)."""
31        self.buildDwarf()
32        self.inferior_crashing_registers()
33
34    @python_api_test
35    def test_inferior_crashing_python(self):
36        """Test that lldb reliably catches the inferior crashing (Python API)."""
37        self.buildDefault()
38        self.inferior_crashing_python()
39
40    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
41    def test_inferior_crashing_expr(self):
42        """Test that the lldb expression interpreter can read from the inferior after crashing (command)."""
43        self.buildDsym()
44        self.inferior_crashing_expr()
45
46    # bugzilla 15784 - the same commands fail when run on Linux from the lldb command line
47    def test_inferior_crashing_expr(self):
48        """Test that the lldb expression interpreter can read from the inferior after crashing (command)."""
49        self.buildDwarf()
50        self.inferior_crashing_expr()
51
52    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
53    def test_inferior_crashing_step(self):
54        """Test that lldb functions correctly after stepping through a crash."""
55        self.buildDsym()
56        self.inferior_crashing_step()
57
58    # bugzilla 15784 - the same commands fail when run on Linux from the lldb command line
59    def test_inferior_crashing_step(self):
60        """Test that lldb functions correctly after stepping through a crash."""
61        self.buildDwarf()
62        self.inferior_crashing_step()
63
64    def set_breakpoint(self, line):
65        lldbutil.run_break_set_by_file_and_line (self, "main.c", line, num_expected_locations=1, loc_exact=True)
66
67    def setUp(self):
68        # Call super's setUp().
69        TestBase.setUp(self)
70        # Find the line number of the crash.
71        self.line = line_number('main.c', '// Crash here.')
72
73    def inferior_crashing(self):
74        """Inferior crashes upon launching; lldb should catch the event and stop."""
75        exe = os.path.join(os.getcwd(), "a.out")
76        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
77
78        self.runCmd("run", RUN_SUCCEEDED)
79
80        if sys.platform.startswith("darwin"):
81            stop_reason = 'stop reason = EXC_BAD_ACCESS'
82        else:
83            stop_reason = 'stop reason = invalid address'
84
85        # The stop reason of the thread should be a bad access exception.
86        self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
87            substrs = ['stopped',
88                       stop_reason])
89
90        # And it should report the correct line number.
91        self.expect("thread backtrace all",
92            substrs = [stop_reason,
93                       'main.c:%d' % self.line])
94
95    def inferior_crashing_python(self):
96        """Inferior crashes upon launching; lldb should catch the event and stop."""
97        exe = os.path.join(os.getcwd(), "a.out")
98
99        target = self.dbg.CreateTarget(exe)
100        self.assertTrue(target, VALID_TARGET)
101
102        # Now launch the process, and do not stop at entry point.
103        # Both argv and envp are null.
104        process = target.LaunchSimple(None, None, os.getcwd())
105
106        import lldbutil
107        if process.GetState() != lldb.eStateStopped:
108            self.fail("Process should be in the 'stopped' state, "
109                      "instead the actual state is: '%s'" %
110                      lldbutil.state_type_to_str(process.GetState()))
111
112        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonException)
113        if not thread:
114            self.fail("Fail to stop the thread upon bad access exception")
115
116        if self.TraceOn():
117            lldbutil.print_stacktrace(thread)
118
119    def inferior_crashing_registers(self):
120        """Test that lldb can read registers after crashing."""
121        exe = os.path.join(os.getcwd(), "a.out")
122        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
123
124        self.runCmd("run", RUN_SUCCEEDED)
125
126        if sys.platform.startswith("darwin"):
127            stop_reason = 'stop reason = EXC_BAD_ACCESS'
128        else:
129            stop_reason = 'stop reason = invalid address'
130
131        # lldb should be able to read from registers from the inferior after crashing.
132        self.expect("register read eax",
133            substrs = ['eax = 0x'])
134
135    def inferior_crashing_expr(self):
136        """Test that the lldb expression interpreter can read symbols after crashing."""
137        exe = os.path.join(os.getcwd(), "a.out")
138        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
139
140        self.runCmd("run", RUN_SUCCEEDED)
141
142        if sys.platform.startswith("darwin"):
143            stop_reason = 'stop reason = EXC_BAD_ACCESS'
144        else:
145            stop_reason = 'stop reason = invalid address'
146
147        # The stop reason of the thread should be a bad access exception.
148        self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
149            substrs = ['stopped', stop_reason])
150
151        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
152        self.expect("p argc",
153            startstr = '(int) $0 = 1')
154
155        self.expect("p hello_world",
156            substrs = ['Hello'])
157
158    def inferior_crashing_step(self):
159        """Test that lldb functions correctly after stepping through a crash."""
160        exe = os.path.join(os.getcwd(), "a.out")
161        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
162
163        self.set_breakpoint(self.line)
164        self.runCmd("run", RUN_SUCCEEDED)
165
166        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
167            substrs = ['main.c:%d' % self.line,
168                       'stop reason = breakpoint'])
169
170        self.runCmd("next")
171
172        if sys.platform.startswith("darwin"):
173            stop_reason = 'stop reason = EXC_BAD_ACCESS'
174        else:
175            stop_reason = 'stop reason = invalid address'
176
177        # The stop reason of the thread should be a bad access exception.
178        self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
179            substrs = ['stopped', stop_reason])
180
181        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
182        self.expect("p argv[0]",
183            substrs = ['a.out'])
184        self.expect("p null_ptr",
185            substrs = ['= 0x0'])
186
187        # lldb should be able to read from registers from the inferior after crashing.
188        self.expect("register read eax",
189            substrs = ['eax = 0x'])
190
191        # And it should report the correct line number.
192        self.expect("thread backtrace all",
193            substrs = [stop_reason,
194                       'main.c:%d' % self.line])
195
196if __name__ == '__main__':
197    import atexit
198    lldb.SBDebugger.Initialize()
199    atexit.register(lambda: lldb.SBDebugger.Terminate())
200    unittest2.main()
201