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"""
Test stepping out from a function in a multi-threaded program.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class ThreadStepOutTestCase(TestBase):
@skipIfWindows # This test will hang on windows llvm.org/pr21753
@expectedFailureAll(oslist=["windows"])
@expectedFailureNetBSD
def test_step_single_thread(self):
"""Test thread step out on one thread via command interpreter."""
self.build()
self.step_out_test(self.step_out_single_thread_with_cmd)
@skipIfWindows # This test will hang on windows llvm.org/pr21753
@expectedFailureAll(oslist=["windows"])
@expectedFailureAll(
oslist=["watchos"], archs=["armv7k"], bugnumber="rdar://problem/34674488"
) # stop reason is trace when it should be step-out
@expectedFailureNetBSD
def test_step_all_threads(self):
"""Test thread step out on all threads via command interpreter."""
self.build()
self.step_out_test(self.step_out_all_threads_with_cmd)
@skipIfWindows # This test will hang on windows llvm.org/pr21753
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24681")
@expectedFailureNetBSD
def test_python(self):
"""Test thread step out on one thread via Python API (dwarf)."""
self.build()
self.step_out_test(self.step_out_with_python)
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# Find the line number for our breakpoint.
self.bkpt_string = "// Set breakpoint here"
self.breakpoint = line_number("main.cpp", self.bkpt_string)
self.step_in_line = line_number("main.cpp", "// But we might still be here")
self.step_out_dest = line_number(
"main.cpp", "// Expect to stop here after step-out."
)
def check_stepping_thread(self):
zeroth_frame = self.step_out_thread.frames[0]
line_entry = zeroth_frame.line_entry
self.assertTrue(line_entry.IsValid(), "Stopped at a valid line entry")
self.assertEqual("main.cpp", line_entry.file.basename, "Still in main.cpp")
# We can't really tell whether we stay on our line
# or get to the next line, it depends on whether there are any
# instructions between the call and the return.
line = line_entry.line
self.assertTrue(
line == self.step_out_dest or line == self.step_in_line,
"Stepped to the wrong line: {0}".format(line),
)
def step_out_single_thread_with_cmd(self):
other_threads = {}
for thread in self.process.threads:
if thread.GetIndexID() == self.step_out_thread.GetIndexID():
continue
other_threads[thread.GetIndexID()] = thread.frames[0].line_entry
# There should be other threads...
self.assertNotEqual(len(other_threads), 0)
self.step_out_with_cmd("this-thread")
# The other threads should not have made progress:
for thread in self.process.threads:
index_id = thread.GetIndexID()
line_entry = other_threads.get(index_id)
if line_entry:
self.assertEqual(
thread.frames[0].line_entry.file.basename,
line_entry.file.basename,
"Thread {0} moved by file".format(index_id),
)
self.assertEqual(
thread.frames[0].line_entry.line,
line_entry.line,
"Thread {0} moved by line".format(index_id),
)
def step_out_all_threads_with_cmd(self):
self.step_out_with_cmd("all-threads")
def step_out_with_cmd(self, run_mode):
self.runCmd("thread select %d" % self.step_out_thread.GetIndexID())
self.runCmd("thread step-out -m %s" % run_mode)
self.expect(
"process status",
"Expected stop reason to be step-out",
substrs=["stop reason = step out"],
)
selected_thread = self.process.GetSelectedThread()
self.assertEqual(
selected_thread.GetIndexID(),
self.step_out_thread.GetIndexID(),
"Step out changed selected thread.",
)
self.check_stepping_thread()
def step_out_with_python(self):
self.step_out_thread.StepOut()
reason = self.step_out_thread.GetStopReason()
self.assertEqual(
lldb.eStopReasonPlanComplete,
reason,
"Expected thread stop reason 'plancomplete', but got '%s'"
% lldbutil.stop_reason_to_str(reason),
)
self.check_stepping_thread()
def step_out_test(self, step_out_func):
"""Test single thread step out of a function."""
(
self.inferior_target,
self.process,
thread,
bkpt,
) = lldbutil.run_to_source_breakpoint(
self, self.bkpt_string, lldb.SBFileSpec("main.cpp"), only_one_thread=False
)
# We hit the breakpoint on at least one thread. If we hit it on both threads
# simultaneously, we can try the step out. Otherwise, suspend the thread
# that hit the breakpoint, and continue till the second thread hits
# the breakpoint:
(breakpoint_threads, other_threads) = ([], [])
lldbutil.sort_stopped_threads(
self.process,
breakpoint_threads=breakpoint_threads,
other_threads=other_threads,
)
if len(breakpoint_threads) == 1:
success = thread.Suspend()
self.assertTrue(success, "Couldn't suspend a thread")
breakpoint_threads = lldbutil.continue_to_breakpoint(self.process, bkpt)
self.assertEqual(len(breakpoint_threads), 2, "Second thread stopped")
success = thread.Resume()
self.assertTrue(success, "Couldn't resume a thread")
self.step_out_thread = breakpoint_threads[0]
# Step out of thread stopped at breakpoint
step_out_func()
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