lldb/test/API/functionalities/unwind/sigtramp/TestSigtrampUnwind.py

   1 """
   2 Test that we can backtrace correctly with 'sigtramp' functions on the stack
   3 """
   4
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test import lldbutil
   9
  10
  11 class SigtrampUnwind(TestBase):
  12     # On different platforms the "_sigtramp" and "__kill" frames are likely to be different.
  13     # This test could probably be adapted to run on linux/*bsd easily enough.
  14     @skipUnlessDarwin
  15     @expectedFailureAll(
  16         archs=["arm64"], bugnumber="<rdar://problem/34006863>"
  17     )  # lldb skips 1 frame on arm64 above _sigtramp
  18     def test(self):
  19         """Test that we can backtrace correctly with _sigtramp on the stack"""
  20         self.build()
  21         self.setTearDownCleanup()
  22
  23         exe = self.getBuildArtifact("a.out")
  24         target = self.dbg.CreateTarget(exe)
  25         self.assertTrue(target, VALID_TARGET)
  26
  27         lldbutil.run_break_set_by_file_and_line(
  28             self,
  29             "main.c",
  30             line_number("main.c", "// Set breakpoint here"),
  31             num_expected_locations=1,
  32         )
  33
  34         process = target.LaunchSimple(None, None, self.get_process_working_directory())
  35
  36         if not process:
  37             self.fail("SBTarget.Launch() failed")
  38
  39         if process.GetState() != lldb.eStateStopped:
  40             self.fail(
  41                 "Process should be in the 'stopped' state, "
  42                 "instead the actual state is: '%s'"
  43                 % lldbutil.state_type_to_str(process.GetState())
  44             )
  45
  46         self.expect(
  47             "pro handle  -n false -p true -s false SIGUSR1",
  48             "Have lldb pass SIGUSR1 signals",
  49             substrs=["SIGUSR1", "true", "false", "false"],
  50         )
  51
  52         lldbutil.run_break_set_by_symbol(
  53             self, "handler", num_expected_locations=1, module_name="a.out"
  54         )
  55
  56         self.runCmd("continue")
  57
  58         thread = process.GetThreadAtIndex(0)
  59
  60         found_handler = False
  61         found_sigtramp = False
  62         found_kill = False
  63         found_main = False
  64
  65         for f in thread.frames:
  66             if f.GetFunctionName() == "handler":
  67                 found_handler = True
  68             if f.GetFunctionName() == "_sigtramp":
  69                 found_sigtramp = True
  70             if f.GetFunctionName() == "__kill":
  71                 found_kill = True
  72             if f.GetFunctionName() == "main":
  73                 found_main = True
  74
  75         if self.TraceOn():
  76             print("Backtrace once we're stopped:")
  77             for f in thread.frames:
  78                 print("  %d %s" % (f.GetFrameID(), f.GetFunctionName()))
  79
  80         if not found_handler:
  81             self.fail("Unable to find handler() in backtrace.")
  82
  83         if not found_sigtramp:
  84             self.fail("Unable to find _sigtramp() in backtrace.")
  85
  86         if not found_kill:
  87             self.fail("Unable to find kill() in backtrace.")
  88
  89         if not found_main:
  90             self.fail("Unable to find main() in backtrace.")