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"""Test that backtraces can follow cross-DSO tail calls"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestCrossDSOTailCalls(TestBase):
@skipIf(compiler="clang", compiler_version=["<", "10.0"])
@skipIf(dwarf_version=["<", "4"])
@expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
@expectedFailureAll(archs=["arm", "aarch64"], bugnumber="llvm.org/PR44561")
def test_cross_dso_tail_calls(self):
self.build()
exe = self.getBuildArtifact("a.out")
target = self.dbg.CreateTarget(exe)
self.assertTrue(target, VALID_TARGET)
# Register our shared libraries for remote targets so they get
# automatically uploaded
environment = self.registerSharedLibrariesWithTarget(target, ["One", "Two"])
lldbutil.run_break_set_by_source_regexp(
self, "// break here", extra_options="-f Two.c"
)
process = target.LaunchSimple(
None, environment, self.get_process_working_directory()
)
self.assertTrue(process, PROCESS_IS_VALID)
# We should be stopped in the second dylib.
thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
# Debug helper:
# self.runCmd("log enable -f /tmp/lldb.log lldb step")
# self.runCmd("bt")
# Check that the backtrace is what we expect:
# frame #0: 0x000000010d5e5f94 libTwo.dylib`tail_called_in_b_from_b at Two.c:7:3 [opt]
# frame #1: 0x000000010d5e5fa0 libTwo.dylib`tail_called_in_b_from_a [opt] [artificial]
# frame #2: 0x000000010d5dcf80 libOne.dylib`helper_in_a [opt] [artificial]
# frame #3: 0x000000010d5dcf79 libOne.dylib`tail_called_in_a_from_main at One.c:10:3 [opt]
# frame #4: 0x000000010d5d3f80 a.out`helper [opt] [artificial]
# frame #5: 0x000000010d5d3f79 a.out`main at main.c:10:3 [opt]
expected_frames = [
("tail_called_in_b_from_b", False),
("tail_called_in_b_from_a", True),
("helper_in_a", True),
("tail_called_in_a_from_main", False),
("helper", True),
("main", False),
]
for idx, (name, is_artificial) in enumerate(expected_frames):
frame = thread.GetFrameAtIndex(idx)
self.assertIn(name, frame.GetDisplayFunctionName())
self.assertEqual(frame.IsArtificial(), is_artificial)
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