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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_dsym(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    def test_inferior_crashing_expr_dwarf(self):
47        """Test that the lldb expression interpreter can read from the inferior after crashing (command)."""
48        self.buildDwarf()
49        self.inferior_crashing_expr()
50
51    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
52    def test_inferior_crashing_step_dsym(self):
53        """Test that lldb functions correctly after stepping through a crash."""
54        self.buildDsym()
55        self.inferior_crashing_step()
56
57    def test_inferior_crashing_step_dwarf(self):
58        """Test that stepping after a crash behaves correctly."""
59        self.buildDwarf()
60        self.inferior_crashing_step()
61
62    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
63    def test_inferior_crashing_step_after_break_dsym(self):
64        """Test that stepping after a crash behaves correctly."""
65        self.buildDsym()
66        self.inferior_crashing_step_after_break()
67
68    @expectedFailureLinux # due to llvm.org/pr15988 -- step over misbehaves after crash
69    def test_inferior_crashing_step_after_break_dwarf(self):
70        """Test that lldb functions correctly after stepping through a crash."""
71        self.buildDwarf()
72        self.inferior_crashing_step_after_break()
73
74    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
75    def test_inferior_crashing_expr_step_and_expr_dsym(self):
76        """Test that lldb expressions work before and after stepping after a crash."""
77        self.buildDsym()
78        self.inferior_crashing_expr_step_expr()
79
80    @expectedFailureLinux # due to llvm.org/pr15989 -- expression fails after crash and step
81    def test_inferior_crashing_expr_step_and_expr_dwarf(self):
82        """Test that lldb expressions work before and after stepping after a crash."""
83        self.buildDwarf()
84        self.inferior_crashing_expr_step_expr()
85
86    def set_breakpoint(self, line):
87        lldbutil.run_break_set_by_file_and_line (self, "main.c", line, num_expected_locations=1, loc_exact=True)
88
89    def check_stop_reason(self):
90        if sys.platform.startswith("darwin"):
91            stop_reason = 'stop reason = EXC_BAD_ACCESS'
92        else:
93            stop_reason = 'stop reason = invalid address'
94
95        # The stop reason of the thread should be a bad access exception.
96        self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
97            substrs = ['stopped',
98                       stop_reason])
99
100        return stop_reason
101
102    def setUp(self):
103        # Call super's setUp().
104        TestBase.setUp(self)
105        # Find the line number of the crash.
106        self.line = line_number('main.c', '// Crash here.')
107
108    def inferior_crashing(self):
109        """Inferior crashes upon launching; lldb should catch the event and stop."""
110        exe = os.path.join(os.getcwd(), "a.out")
111        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
112
113        self.runCmd("run", RUN_SUCCEEDED)
114        stop_reason = self.check_stop_reason()
115
116        # And it should report the correct line number.
117        self.expect("thread backtrace all",
118            substrs = [stop_reason,
119                       'main.c:%d' % self.line])
120
121    def inferior_crashing_python(self):
122        """Inferior crashes upon launching; lldb should catch the event and stop."""
123        exe = os.path.join(os.getcwd(), "a.out")
124
125        target = self.dbg.CreateTarget(exe)
126        self.assertTrue(target, VALID_TARGET)
127
128        # Now launch the process, and do not stop at entry point.
129        # Both argv and envp are null.
130        process = target.LaunchSimple(None, None, os.getcwd())
131
132        if process.GetState() != lldb.eStateStopped:
133            self.fail("Process should be in the 'stopped' state, "
134                      "instead the actual state is: '%s'" %
135                      lldbutil.state_type_to_str(process.GetState()))
136
137        thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonException)
138        if not thread:
139            self.fail("Fail to stop the thread upon bad access exception")
140
141        if self.TraceOn():
142            lldbutil.print_stacktrace(thread)
143
144    def inferior_crashing_registers(self):
145        """Test that lldb can read registers after crashing."""
146        exe = os.path.join(os.getcwd(), "a.out")
147        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
148
149        self.runCmd("run", RUN_SUCCEEDED)
150        self.check_stop_reason()
151
152        # lldb should be able to read from registers from the inferior after crashing.
153        self.expect("register read eax",
154            substrs = ['eax = 0x'])
155
156    def inferior_crashing_expr(self):
157        """Test that the lldb expression interpreter can read symbols after crashing."""
158        exe = os.path.join(os.getcwd(), "a.out")
159        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
160
161        self.runCmd("run", RUN_SUCCEEDED)
162        self.check_stop_reason()
163
164        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
165        self.expect("p argc",
166            startstr = '(int) $0 = 1')
167
168        self.expect("p hello_world",
169            substrs = ['Hello'])
170
171    def inferior_crashing_step(self):
172        """Test that lldb functions correctly after stepping through a crash."""
173        exe = os.path.join(os.getcwd(), "a.out")
174        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
175
176        self.set_breakpoint(self.line)
177        self.runCmd("run", RUN_SUCCEEDED)
178
179        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
180            substrs = ['main.c:%d' % self.line,
181                       'stop reason = breakpoint'])
182
183        self.runCmd("next")
184        stop_reason = self.check_stop_reason()
185
186        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
187        self.expect("p argv[0]",
188            substrs = ['a.out'])
189        self.expect("p null_ptr",
190            substrs = ['= 0x0'])
191
192        # lldb should be able to read from registers from the inferior after crashing.
193        self.expect("register read eax",
194            substrs = ['eax = 0x'])
195
196        # And it should report the correct line number.
197        self.expect("thread backtrace all",
198            substrs = [stop_reason,
199                       'main.c:%d' % self.line])
200
201    def inferior_crashing_step_after_break(self):
202        """Test that lldb behaves correctly when stepping after a crash."""
203        exe = os.path.join(os.getcwd(), "a.out")
204        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
205
206        self.runCmd("run", RUN_SUCCEEDED)
207        self.check_stop_reason()
208
209        self.runCmd("next")
210        self.check_stop_reason()
211
212    def inferior_crashing_expr_step_expr(self):
213        """Test that lldb expressions work before and after stepping after a crash."""
214        exe = os.path.join(os.getcwd(), "a.out")
215        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
216
217        self.runCmd("run", RUN_SUCCEEDED)
218        self.check_stop_reason()
219
220        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
221        self.expect("p argv[0]",
222            substrs = ['a.out'])
223
224        self.runCmd("next")
225        self.check_stop_reason()
226
227        # The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
228        self.expect("p argv[0]",
229            substrs = ['a.out'])
230
231
232if __name__ == '__main__':
233    import atexit
234    lldb.SBDebugger.Initialize()
235    atexit.register(lambda: lldb.SBDebugger.Terminate())
236    unittest2.main()
237