|
| 1 | +"""Test that lldb steps correctly after the inferior has crashed.""" |
| 2 | + |
| 3 | +from __future__ import print_function |
| 4 | + |
| 5 | +import os |
| 6 | +import time |
| 7 | +import lldb |
| 8 | +from lldbsuite.test import lldbutil |
| 9 | +from lldbsuite.test import lldbplatformutil |
| 10 | +from lldbsuite.test.decorators import * |
| 11 | +from lldbsuite.test.lldbtest import * |
| 12 | + |
| 13 | + |
| 14 | +class CrashingInferiorStepTestCase(TestBase): |
| 15 | + |
| 16 | + mydir = TestBase.compute_mydir(__file__) |
| 17 | + |
| 18 | + @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778") |
| 19 | + @expectedFailureNetBSD |
| 20 | + def test_inferior_crashing(self): |
| 21 | + """Test that lldb reliably catches the inferior crashing (command).""" |
| 22 | + self.build() |
| 23 | + self.inferior_crashing() |
| 24 | + |
| 25 | + @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778") |
| 26 | + def test_inferior_crashing_register(self): |
| 27 | + """Test that lldb reliably reads registers from the inferior after crashing (command).""" |
| 28 | + self.build() |
| 29 | + self.inferior_crashing_registers() |
| 30 | + |
| 31 | + @add_test_categories(['pyapi']) |
| 32 | + def test_inferior_crashing_python(self): |
| 33 | + """Test that lldb reliably catches the inferior crashing (Python API).""" |
| 34 | + self.build() |
| 35 | + self.inferior_crashing_python() |
| 36 | + |
| 37 | + def test_inferior_crashing_expr(self): |
| 38 | + """Test that the lldb expression interpreter can read from the inferior after crashing (command).""" |
| 39 | + self.build() |
| 40 | + self.inferior_crashing_expr() |
| 41 | + |
| 42 | + @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778") |
| 43 | + def test_inferior_crashing_step(self): |
| 44 | + """Test that stepping after a crash behaves correctly.""" |
| 45 | + self.build() |
| 46 | + self.inferior_crashing_step() |
| 47 | + |
| 48 | + @skipIfTargetAndroid() # debuggerd interferes with this test on Android |
| 49 | + @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778") |
| 50 | + def test_inferior_crashing_step_after_break(self): |
| 51 | + """Test that lldb functions correctly after stepping through a crash.""" |
| 52 | + self.build() |
| 53 | + self.inferior_crashing_step_after_break() |
| 54 | + |
| 55 | + # Inferior exits after stepping after a segfault. This is working as |
| 56 | + # intended IMHO. |
| 57 | + @skipIfLinux |
| 58 | + @skipIfFreeBSD |
| 59 | + @expectedFailureNetBSD |
| 60 | + def test_inferior_crashing_expr_step_and_expr(self): |
| 61 | + """Test that lldb expressions work before and after stepping after a crash.""" |
| 62 | + self.build() |
| 63 | + self.inferior_crashing_expr_step_expr() |
| 64 | + |
| 65 | + def set_breakpoint(self, line): |
| 66 | + lldbutil.run_break_set_by_file_and_line( |
| 67 | + self, "main.c", line, num_expected_locations=1, loc_exact=True) |
| 68 | + |
| 69 | + def check_stop_reason(self): |
| 70 | + # We should have one crashing thread |
| 71 | + self.assertEqual( |
| 72 | + len( |
| 73 | + lldbutil.get_crashed_threads( |
| 74 | + self, |
| 75 | + self.dbg.GetSelectedTarget().GetProcess())), 1, |
| 76 | + STOPPED_DUE_TO_EXC_BAD_ACCESS) |
| 77 | + |
| 78 | + def get_api_stop_reason(self): |
| 79 | + return lldb.eStopReasonException |
| 80 | + |
| 81 | + def setUp(self): |
| 82 | + # Call super's setUp(). |
| 83 | + TestBase.setUp(self) |
| 84 | + # Find the line number of the crash. |
| 85 | + self.line = line_number('main.c', '// Crash here.') |
| 86 | + |
| 87 | + def inferior_crashing(self): |
| 88 | + """Inferior crashes upon launching; lldb should catch the event and stop.""" |
| 89 | + exe = self.getBuildArtifact("a.out") |
| 90 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 91 | + |
| 92 | + self.runCmd("run", RUN_SUCCEEDED) |
| 93 | + # The exact stop reason depends on the platform |
| 94 | + if self.platformIsDarwin(): |
| 95 | + stop_reason = 'stop reason = EXC_BAD_ACCESS' |
| 96 | + elif self.getPlatform() == "linux" or self.getPlatform() == "freebsd": |
| 97 | + stop_reason = 'stop reason = signal SIGSEGV' |
| 98 | + else: |
| 99 | + stop_reason = 'stop reason = invalid address' |
| 100 | + self.expect( |
| 101 | + "thread list", |
| 102 | + STOPPED_DUE_TO_EXC_BAD_ACCESS, |
| 103 | + substrs=['stopped', stop_reason]) |
| 104 | + |
| 105 | + # And it should report the correct line number. |
| 106 | + self.expect( |
| 107 | + "thread backtrace all", |
| 108 | + substrs=[stop_reason, 'main.c:%d' % self.line]) |
| 109 | + |
| 110 | + def inferior_crashing_python(self): |
| 111 | + """Inferior crashes upon launching; lldb should catch the event and stop.""" |
| 112 | + exe = self.getBuildArtifact("a.out") |
| 113 | + |
| 114 | + target = self.dbg.CreateTarget(exe) |
| 115 | + self.assertTrue(target, VALID_TARGET) |
| 116 | + |
| 117 | + # Now launch the process, and do not stop at entry point. |
| 118 | + # Both argv and envp are null. |
| 119 | + process = target.LaunchSimple(None, None, |
| 120 | + self.get_process_working_directory()) |
| 121 | + |
| 122 | + if process.GetState() != lldb.eStateStopped: |
| 123 | + self.fail("Process should be in the 'stopped' state, " |
| 124 | + "instead the actual state is: '%s'" % |
| 125 | + lldbutil.state_type_to_str(process.GetState())) |
| 126 | + |
| 127 | + threads = lldbutil.get_crashed_threads(self, process) |
| 128 | + self.assertEqual( |
| 129 | + len(threads), 1, |
| 130 | + "Failed to stop the thread upon bad access exception") |
| 131 | + |
| 132 | + if self.TraceOn(): |
| 133 | + lldbutil.print_stacktrace(threads[0]) |
| 134 | + |
| 135 | + def inferior_crashing_registers(self): |
| 136 | + """Test that lldb can read registers after crashing.""" |
| 137 | + exe = self.getBuildArtifact("a.out") |
| 138 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 139 | + |
| 140 | + self.runCmd("run", RUN_SUCCEEDED) |
| 141 | + self.check_stop_reason() |
| 142 | + |
| 143 | + # lldb should be able to read from registers from the inferior after |
| 144 | + # crashing. |
| 145 | + lldbplatformutil.check_first_register_readable(self) |
| 146 | + |
| 147 | + def inferior_crashing_expr(self): |
| 148 | + """Test that the lldb expression interpreter can read symbols after crashing.""" |
| 149 | + exe = self.getBuildArtifact("a.out") |
| 150 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 151 | + |
| 152 | + self.runCmd("run", RUN_SUCCEEDED) |
| 153 | + self.check_stop_reason() |
| 154 | + |
| 155 | + # The lldb expression interpreter should be able to read from addresses |
| 156 | + # of the inferior after a crash. |
| 157 | + self.expect("p argc", startstr='(int) $0 = 1') |
| 158 | + |
| 159 | + self.expect("p hello_world", substrs=['Hello']) |
| 160 | + |
| 161 | + def inferior_crashing_step(self): |
| 162 | + """Test that lldb functions correctly after stepping through a crash.""" |
| 163 | + exe = self.getBuildArtifact("a.out") |
| 164 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 165 | + |
| 166 | + self.set_breakpoint(self.line) |
| 167 | + self.runCmd("run", RUN_SUCCEEDED) |
| 168 | + |
| 169 | + self.expect( |
| 170 | + "thread list", |
| 171 | + STOPPED_DUE_TO_BREAKPOINT, |
| 172 | + substrs=['main.c:%d' % self.line, 'stop reason = breakpoint']) |
| 173 | + |
| 174 | + self.runCmd("next") |
| 175 | + self.check_stop_reason() |
| 176 | + |
| 177 | + # The lldb expression interpreter should be able to read from addresses |
| 178 | + # of the inferior after a crash. |
| 179 | + self.expect("p argv[0]", substrs=['a.out']) |
| 180 | + self.expect("p null_ptr", substrs=['= 0x0']) |
| 181 | + |
| 182 | + # lldb should be able to read from registers from the inferior after |
| 183 | + # crashing. |
| 184 | + lldbplatformutil.check_first_register_readable(self) |
| 185 | + |
| 186 | + # And it should report the correct line number. |
| 187 | + self.expect("thread backtrace all", substrs=['main.c:%d' % self.line]) |
| 188 | + |
| 189 | + def inferior_crashing_step_after_break(self): |
| 190 | + """Test that lldb behaves correctly when stepping after a crash.""" |
| 191 | + exe = self.getBuildArtifact("a.out") |
| 192 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 193 | + |
| 194 | + self.runCmd("run", RUN_SUCCEEDED) |
| 195 | + self.check_stop_reason() |
| 196 | + |
| 197 | + expected_state = 'exited' # Provide the exit code. |
| 198 | + if self.platformIsDarwin(): |
| 199 | + # TODO: Determine why 'next' and 'continue' have no effect after a |
| 200 | + # crash. |
| 201 | + expected_state = 'stopped' |
| 202 | + |
| 203 | + self.expect("next", substrs=['Process', expected_state]) |
| 204 | + |
| 205 | + if expected_state == 'exited': |
| 206 | + self.expect( |
| 207 | + "thread list", |
| 208 | + error=True, |
| 209 | + substrs=['Process must be launched']) |
| 210 | + else: |
| 211 | + self.check_stop_reason() |
| 212 | + |
| 213 | + def inferior_crashing_expr_step_expr(self): |
| 214 | + """Test that lldb expressions work before and after stepping after a crash.""" |
| 215 | + exe = self.getBuildArtifact("a.out") |
| 216 | + self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET) |
| 217 | + |
| 218 | + self.runCmd("run", RUN_SUCCEEDED) |
| 219 | + self.check_stop_reason() |
| 220 | + |
| 221 | + # The lldb expression interpreter should be able to read from addresses |
| 222 | + # of the inferior after a crash. |
| 223 | + self.expect("p argv[0]", substrs=['a.out']) |
| 224 | + |
| 225 | + self.runCmd("next") |
| 226 | + self.check_stop_reason() |
| 227 | + |
| 228 | + # The lldb expression interpreter should be able to read from addresses |
| 229 | + # of the inferior after a crash. |
| 230 | + self.expect("p argv[0]", substrs=['a.out']) |
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