"""
Test that we can backtrace correctly with 'sigtramp' functions on the stack
"""

from __future__ import print_function


import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil


class SigtrampUnwind(TestBase):
    mydir = TestBase.compute_mydir(__file__)

    # On different platforms the "_sigtramp" and "__kill" frames are likely to be different.
    # This test could probably be adapted to run on linux/*bsd easily enough.
    @skipUnlessDarwin
    @expectedFailureAll(oslist=["ios", "watchos", "tvos", "bridgeos"], bugnumber="<rdar://problem/34006863>")  # lldb skips 1 frame on arm64 above _sigtramp
    def test(self):
        """Test that we can backtrace correctly with _sigtramp on the stack"""
        self.build()
        self.setTearDownCleanup()

        exe = self.getBuildArtifact("a.out")
        target = self.dbg.CreateTarget(exe)
        self.assertTrue(target, VALID_TARGET)

        lldbutil.run_break_set_by_file_and_line(self, "main.c", line_number(
            'main.c', '// Set breakpoint here'), num_expected_locations=1)

        process = target.LaunchSimple(
            None, None, self.get_process_working_directory())

        if not process:
            self.fail("SBTarget.Launch() failed")

        if process.GetState() != lldb.eStateStopped:
            self.fail("Process should be in the 'stopped' state, "
                      "instead the actual state is: '%s'" %
                      lldbutil.state_type_to_str(process.GetState()))

        self.expect(
            "pro handle  -n false -p true -s false SIGUSR1",
            "Have lldb pass SIGUSR1 signals",
            substrs=[
                "SIGUSR1",
                "true",
                "false",
                "false"])

        lldbutil.run_break_set_by_symbol(
            self,
            "handler",
            num_expected_locations=1,
            module_name="a.out")

        self.runCmd("continue")

        thread = process.GetThreadAtIndex(0)

        found_handler = False
        found_sigtramp = False
        found_kill = False
        found_main = False

        for f in thread.frames:
            if f.GetFunctionName() == "handler":
                found_handler = True
            if f.GetFunctionName() == "_sigtramp":
                found_sigtramp = True
            if f.GetFunctionName() == "__kill":
                found_kill = True
            if f.GetFunctionName() == "main":
                found_main = True

        if self.TraceOn():
            print("Backtrace once we're stopped:")
            for f in thread.frames:
                print("  %d %s" % (f.GetFrameID(), f.GetFunctionName()))

        if not found_handler:
            self.fail("Unable to find handler() in backtrace.")

        if not found_sigtramp:
            self.fail("Unable to find _sigtramp() in backtrace.")

        if not found_kill:
            self.fail("Unable to find kill() in backtrace.")

        if not found_main:
            self.fail("Unable to find main() in backtrace.")
