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"""Test that lldb functions correctly after the inferior has crashed while in a recursive routine."""
from __future__ import print_function
import os, time
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbplatformutil
from lldbsuite.test import lldbutil
class CrashingRecursiveInferiorTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
@expectedFailureAll(oslist=['freebsd'], bugnumber="llvm.org/pr23699 SIGSEGV is reported as exception, not signal")
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing(self):
"""Test that lldb reliably catches the inferior crashing (command)."""
self.build()
self.recursive_inferior_crashing()
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing_register(self):
"""Test that lldb reliably reads registers from the inferior after crashing (command)."""
self.build()
self.recursive_inferior_crashing_registers()
@add_test_categories(['pyapi'])
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing_python(self):
"""Test that lldb reliably catches the inferior crashing (Python API)."""
self.build()
self.recursive_inferior_crashing_python()
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing_expr(self):
"""Test that the lldb expression interpreter can read from the inferior after crashing (command)."""
self.build()
self.recursive_inferior_crashing_expr()
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing_step(self):
"""Test that stepping after a crash behaves correctly."""
self.build()
self.recursive_inferior_crashing_step()
@expectedFailureAll(oslist=['freebsd'], bugnumber='llvm.org/pr24939')
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
@expectedFailureAndroid(archs=['aarch64'], api_levels=list(range(21 + 1))) # No eh_frame for sa_restorer
def test_recursive_inferior_crashing_step_after_break(self):
"""Test that lldb functions correctly after stepping through a crash."""
self.build()
self.recursive_inferior_crashing_step_after_break()
@skipIfLinux # Inferior exits after stepping after a segfault. This is working as intended IMHO.
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
def test_recursive_inferior_crashing_expr_step_and_expr(self):
"""Test that lldb expressions work before and after stepping after a crash."""
self.build()
self.recursive_inferior_crashing_expr_step_expr()
def set_breakpoint(self, line):
lldbutil.run_break_set_by_file_and_line (self, "main.c", line, num_expected_locations=1, loc_exact=True)
def check_stop_reason(self):
# We should have one crashing thread
self.assertEqual(
len(lldbutil.get_crashed_threads(self, self.dbg.GetSelectedTarget().GetProcess())),
1,
STOPPED_DUE_TO_EXC_BAD_ACCESS)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number of the crash.
self.line = line_number('main.c', '// Crash here.')
def recursive_inferior_crashing(self):
"""Inferior crashes upon launching; lldb should catch the event and stop."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.runCmd("run", RUN_SUCCEEDED)
# The exact stop reason depends on the platform
if self.platformIsDarwin():
stop_reason = 'stop reason = EXC_BAD_ACCESS'
elif self.getPlatform() == "linux":
stop_reason = 'stop reason = signal SIGSEGV'
else:
stop_reason = 'stop reason = invalid address'
self.expect("thread list", STOPPED_DUE_TO_EXC_BAD_ACCESS,
substrs = ['stopped',
stop_reason])
# And it should report a backtrace that includes main and the crash site.
self.expect("thread backtrace all",
substrs = [stop_reason, 'main', 'argc', 'argv', 'recursive_function'])
# And it should report the correct line number.
self.expect("thread backtrace all",
substrs = [stop_reason,
'main.c:%d' % self.line])
def recursive_inferior_crashing_python(self):
"""Inferior crashes upon launching; lldb should catch the event and stop."""
exe = os.path.join(os.getcwd(), "a.out")
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Now launch the process, and do not stop at entry point.
# Both argv and envp are null.
process = target.LaunchSimple (None, None, self.get_process_working_directory())
if process.GetState() != lldb.eStateStopped:
self.fail("Process should be in the 'stopped' state, "
"instead the actual state is: '%s'" %
lldbutil.state_type_to_str(process.GetState()))
threads = lldbutil.get_crashed_threads(self, process)
self.assertEqual(len(threads), 1, "Failed to stop the thread upon bad access exception")
if self.TraceOn():
lldbutil.print_stacktrace(threads[0])
def recursive_inferior_crashing_registers(self):
"""Test that lldb can read registers after crashing."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.runCmd("run", RUN_SUCCEEDED)
self.check_stop_reason()
# lldb should be able to read from registers from the inferior after crashing.
lldbplatformutil.check_first_register_readable(self)
def recursive_inferior_crashing_expr(self):
"""Test that the lldb expression interpreter can read symbols after crashing."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.runCmd("run", RUN_SUCCEEDED)
self.check_stop_reason()
# The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
self.expect("p i",
startstr = '(int) $0 =')
def recursive_inferior_crashing_step(self):
"""Test that lldb functions correctly after stepping through a crash."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.set_breakpoint(self.line)
self.runCmd("run", RUN_SUCCEEDED)
self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
substrs = ['main.c:%d' % self.line,
'stop reason = breakpoint'])
self.runCmd("next")
self.check_stop_reason()
# The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
self.expect("p i",
substrs = ['(int) $0 ='])
# lldb should be able to read from registers from the inferior after crashing.
lldbplatformutil.check_first_register_readable(self)
# And it should report the correct line number.
self.expect("thread backtrace all",
substrs = ['main.c:%d' % self.line])
def recursive_inferior_crashing_step_after_break(self):
"""Test that lldb behaves correctly when stepping after a crash."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.runCmd("run", RUN_SUCCEEDED)
self.check_stop_reason()
expected_state = 'exited' # Provide the exit code.
if self.platformIsDarwin():
expected_state = 'stopped' # TODO: Determine why 'next' and 'continue' have no effect after a crash.
elif re.match(".*-.*-.*-android", self.dbg.GetSelectedPlatform().GetTriple()):
expected_state = 'stopped' # android has a default SEGV handler, which will re-raise the signal, so we come up stopped again
self.expect("next",
substrs = ['Process', expected_state])
if expected_state == 'exited':
self.expect("thread list", error=True,substrs = ['Process must be launched'])
else:
self.check_stop_reason()
def recursive_inferior_crashing_expr_step_expr(self):
"""Test that lldb expressions work before and after stepping after a crash."""
exe = os.path.join(os.getcwd(), "a.out")
self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
self.runCmd("run", RUN_SUCCEEDED)
self.check_stop_reason()
# The lldb expression interpreter should be able to read from addresses of the inferior after a crash.
self.expect("p null",
startstr = '(char *) $0 = 0x0')
self.runCmd("next")
# The lldb expression interpreter should be able to read from addresses of the inferior after a step.
self.expect("p null",
startstr = '(char *) $1 = 0x0')
self.check_stop_reason()
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