1"""
2Test lldb ability to unwind a stack with a function containing a call to the
3'__builtin_trap' intrinsic, which GCC (4.6) encodes to an illegal opcode.
4"""
5
6import os
7import unittest2
8import lldb
9from lldbtest import *
10import lldbutil
11
12class BuiltinTrapTestCase(TestBase):
13
14    mydir = os.path.join("linux", "builtin_trap")
15
16    @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
17    @dsym_test
18    def test_with_dsym_and_run_command(self):
19        """Test that LLDB handles a function with __builtin_trap correctly."""
20        self.buildDsym()
21        self.builtin_trap_unwind()
22
23    @dwarf_test
24    @expectedFailureGcc # llvm.org/pr15936: LLDB is omits a function that contains an
25                        #           illegal opcode from backtraces. This
26                        #           failure is GCC 4.6 specific.
27    def test_with_dwarf_and_run_command(self):
28        """Test that LLDB handles a function with __builtin_trap correctly."""
29        self.buildDwarf()
30        self.builtin_trap_unwind()
31
32    def setUp(self):
33        # Call super's setUp().
34        TestBase.setUp(self)
35        # Find the line number to break at.
36        self.line = line_number('main.cpp', '// Set break point at this line.')
37
38    def builtin_trap_unwind(self):
39        """Test that LLDB handles unwinding a frame that contains a function
40           with a __builtin_trap intrinsic.
41        """
42        self.runCmd("file a.out", CURRENT_EXECUTABLE_SET)
43
44        lldbutil.run_break_set_by_file_and_line (self, "main.cpp", self.line,
45                                                 num_expected_locations=1,
46                                                 loc_exact=True)
47
48        self.runCmd("run", RUN_SUCCEEDED)
49
50        # The stop reason of the thread should be breakpoint.
51        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
52            substrs = ['stopped',
53                       'stop reason = breakpoint'])
54
55        # print backtrace, expect both 'bar' and 'main' functions to be listed
56        self.expect('bt', substrs = ['bar', 'main'])
57
58        # go up one frame
59        self.runCmd("up", RUN_SUCCEEDED)
60
61        # evaluate a local
62        self.expect('p foo', substrs = ['= 5'])
63
64
65
66if __name__ == '__main__':
67    import atexit
68    lldb.SBDebugger.Initialize()
69    atexit.register(lambda: lldb.SBDebugger.Terminate())
70    unittest2.main()
71