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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):
mydir = TestBase.compute_mydir(__file__)
# Test occasionally times out on the Linux build bot
@skipIfLinux
@expectedFailureAll(
oslist=["linux"],
bugnumber="llvm.org/pr23477 Test occasionally times out on the Linux build bot")
@expectedFailureAll(
oslist=["freebsd"],
bugnumber="llvm.org/pr18066 inferior does not exit")
@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(dictionary=self.getBuildFlags())
self.step_out_test(self.step_out_single_thread_with_cmd)
# Test occasionally times out on the Linux build bot
@skipIfLinux
@expectedFailureAll(
oslist=["linux"],
bugnumber="llvm.org/pr23477 Test occasionally times out on the Linux build bot")
@expectedFailureAll(
oslist=["freebsd"],
bugnumber="llvm.org/pr19347 2nd thread stops at breakpoint")
@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(dictionary=self.getBuildFlags())
self.step_out_test(self.step_out_all_threads_with_cmd)
# Test occasionally times out on the Linux build bot
@skipIfLinux
@expectedFailureAll(
oslist=["linux"],
bugnumber="llvm.org/pr23477 Test occasionally times out on the Linux build bot")
@expectedFailureAll(
oslist=["freebsd"],
bugnumber="llvm.org/pr19347 2nd thread stops at breakpoint")
@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(dictionary=self.getBuildFlags())
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)
if "gcc" in self.getCompiler() or self.isIntelCompiler():
self.step_out_destination = line_number(
'main.cpp', '// Expect to stop here after step-out (icc and gcc)')
else:
self.step_out_destination = line_number(
'main.cpp', '// Expect to stop here after step-out (clang)')
def step_out_single_thread_with_cmd(self):
self.step_out_with_cmd("this-thread")
self.expect(
"thread backtrace all",
"Thread location after step out is correct",
substrs=[
"main.cpp:%d" %
self.step_out_destination,
"main.cpp:%d" %
self.breakpoint])
def step_out_all_threads_with_cmd(self):
self.step_out_with_cmd("all-threads")
self.expect(
"thread backtrace all",
"Thread location after step out is correct",
substrs=[
"main.cpp:%d" %
self.step_out_destination])
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"])
self.expect(
"thread list",
"Selected thread did not change during step-out",
substrs=[
"* thread #%d" %
self.step_out_thread.GetIndexID()])
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))
# Verify location after stepping out
frame = self.step_out_thread.GetFrameAtIndex(0)
desc = lldbutil.get_description(frame.GetLineEntry())
expect = "main.cpp:%d" % self.step_out_destination
self.assertTrue(
expect in desc, "Expected %s but thread stopped at %s" %
(expect, desc))
def step_out_test(self, step_out_func):
"""Test single thread step out of a function."""
(self.inferior_target, self.inferior_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.inferior_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")
bkpt_threads = lldbutil.continue_to_breakpoint(bkpt)
self.assertEqual(len(bkpt_threads), 1, "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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