"""
Use lldb Python API to make sure the dynamic checkers are doing their jobs.
"""

from __future__ import print_function


import os
import time
import re
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil


class ObjCCheckerTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    NO_DEBUG_INFO_TESTCASE = True

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)

        # Find the line number to break for main.c.
        self.source_name = 'main.m'

    @skipUnlessDarwin
    @add_test_categories(['pyapi'])
    def test_objc_checker(self):
        """Test that checkers catch unrecognized selectors"""
        if self.getArchitecture() == 'i386':
            self.skipTest("requires Objective-C 2.0 runtime")

        self.build()
        exe = self.getBuildArtifact("a.out")

        # Create a target from the debugger.

        target = self.dbg.CreateTarget(exe)
        self.assertTrue(target, VALID_TARGET)

        # Set up our breakpoints:

        main_bkpt = target.BreakpointCreateBySourceRegex(
            "Set a breakpoint here.", lldb.SBFileSpec(self.source_name))
        self.assertTrue(main_bkpt and
                        main_bkpt.GetNumLocations() == 1,
                        VALID_BREAKPOINT)

        # Now launch the process, and do not stop at the entry point.
        process = target.LaunchSimple(
            None, None, self.get_process_working_directory())

        self.assertTrue(process.GetState() == lldb.eStateStopped,
                        PROCESS_STOPPED)

        threads = lldbutil.get_threads_stopped_at_breakpoint(
            process, main_bkpt)
        self.assertTrue(len(threads) == 1)
        thread = threads[0]

        #
        #  The class Simple doesn't have a count method.  Make sure that we don't
        #  actually try to send count but catch it as an unrecognized selector.

        frame = thread.GetFrameAtIndex(0)
        expr_value = frame.EvaluateExpression("(int) [my_simple count]", False)
        expr_error = expr_value.GetError()

        self.assertTrue(expr_error.Fail())

        # Make sure the call produced no NSLog stdout.
        stdout = process.GetSTDOUT(100)
        self.assertTrue(stdout is None or (len(stdout) == 0))

        # Make sure the error is helpful:
        err_string = expr_error.GetCString()
        self.assertTrue("selector" in err_string)

        #
        # Check that we correctly insert the checker for an
        # ObjC method with the struct return convention.
        # Getting this wrong would cause us to call the checker
        # with the wrong arguments, and the checker would crash
        # So I'm just checking "expression runs successfully" here:
        #
        expr_value = frame.EvaluateExpression("[my_simple getBigStruct]", False)
        expr_error = expr_value.GetError()
        
        self.assertTrue(expr_error.Success())
        
