lldb/test/API/functionalities/tail_call_frames/cross_dso/TestCrossDSOTailCalls.py

   1 """Test that backtraces can follow cross-DSO tail calls"""
   2
   3
   4 import lldb
   5 from lldbsuite.test.decorators import *
   6 from lldbsuite.test.lldbtest import *
   7 from lldbsuite.test import lldbutil
   8
   9
  10 class TestCrossDSOTailCalls(TestBase):
  11     @skipIf(compiler="clang", compiler_version=["<", "10.0"])
  12     @skipIf(dwarf_version=["<", "4"])
  13     @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr26265")
  14     @expectedFailureAll(archs=["arm", "aarch64"], bugnumber="llvm.org/PR44561")
  15     def test_cross_dso_tail_calls(self):
  16         self.build()
  17         exe = self.getBuildArtifact("a.out")
  18         target = self.dbg.CreateTarget(exe)
  19         self.assertTrue(target, VALID_TARGET)
  20
  21         # Register our shared libraries for remote targets so they get
  22         # automatically uploaded
  23         environment = self.registerSharedLibrariesWithTarget(target, ["One", "Two"])
  24
  25         lldbutil.run_break_set_by_source_regexp(
  26             self, "// break here", extra_options="-f Two.c"
  27         )
  28
  29         process = target.LaunchSimple(
  30             None, environment, self.get_process_working_directory()
  31         )
  32         self.assertTrue(process, PROCESS_IS_VALID)
  33
  34         # We should be stopped in the second dylib.
  35         thread = lldbutil.get_stopped_thread(process, lldb.eStopReasonBreakpoint)
  36
  37         # Debug helper:
  38         # self.runCmd("log enable -f /tmp/lldb.log lldb step")
  39         # self.runCmd("bt")
  40
  41         # Check that the backtrace is what we expect:
  42         #  frame #0: 0x000000010d5e5f94 libTwo.dylib`tail_called_in_b_from_b at Two.c:7:3 [opt]
  43         #  frame #1: 0x000000010d5e5fa0 libTwo.dylib`tail_called_in_b_from_a [opt] [artificial]
  44         #  frame #2: 0x000000010d5dcf80 libOne.dylib`helper_in_a [opt] [artificial]
  45         #  frame #3: 0x000000010d5dcf79 libOne.dylib`tail_called_in_a_from_main at One.c:10:3 [opt]
  46         #  frame #4: 0x000000010d5d3f80 a.out`helper [opt] [artificial]
  47         #  frame #5: 0x000000010d5d3f79 a.out`main at main.c:10:3 [opt]
  48         expected_frames = [
  49             ("tail_called_in_b_from_b", False),
  50             ("tail_called_in_b_from_a", True),
  51             ("helper_in_a", True),
  52             ("tail_called_in_a_from_main", False),
  53             ("helper", True),
  54             ("main", False),
  55         ]
  56         for idx, (name, is_artificial) in enumerate(expected_frames):
  57             frame = thread.GetFrameAtIndex(idx)
  58             self.assertIn(name, frame.GetDisplayFunctionName())
  59             self.assertEqual(frame.IsArtificial(), is_artificial)