"""Test variable with function ptr type and that break on the function works."""

from __future__ import print_function


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


class FunctionTypesTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line number to break inside main().
        self.line = line_number('main.c', '// Set break point at this line.')

    def test(self):
        """Test 'callback' has function ptr type, then break on the function."""
        self.build()
        self.runToBreakpoint()

        # Check that the 'callback' variable display properly.
        self.expect(
            "frame variable --show-types callback",
            VARIABLES_DISPLAYED_CORRECTLY,
            startstr='(int (*)(const char *)) callback =')

        # And that we can break on the callback function.
        lldbutil.run_break_set_by_symbol(
            self,
            "string_not_empty",
            num_expected_locations=1,
            sym_exact=True)
        self.runCmd("continue")

        # Check that we do indeed stop on the string_not_empty function.
        self.expect("process status", STOPPED_DUE_TO_BREAKPOINT,
                    substrs=['a.out`string_not_empty',
                             'stop reason = breakpoint'])

    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr21765")
    def test_pointers(self):
        """Test that a function pointer to 'printf' works and can be called."""
        self.build()
        self.runToBreakpoint()

        self.expect("expr string_not_empty",
                    substrs=['(int (*)(const char *)) $0 = ', '(a.out`'])

        if self.platformIsDarwin():
            regexps = ['lib.*\.dylib`printf']
        else:
            regexps = ['printf']
        self.expect("expr (int (*)(const char*, ...))printf",
                    substrs=['(int (*)(const char *, ...)) $1 = '],
                    patterns=regexps)

        self.expect("expr $1(\"Hello world\\n\")",
                    startstr='(int) $2 = 12')

    def runToBreakpoint(self):
        exe = self.getBuildArtifact("a.out")
        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)

        # Break inside the main.
        lldbutil.run_break_set_by_file_and_line(
            self, "main.c", self.line, num_expected_locations=1, loc_exact=True)

        self.runCmd("run", RUN_SUCCEEDED)

        # The stop reason of the thread should be breakpoint.
        self.expect("thread list", STOPPED_DUE_TO_BREAKPOINT,
                    substrs=['stopped',
                             'stop reason = breakpoint'])

        # The breakpoint should have a hit count of 1.
        self.expect("breakpoint list -f", BREAKPOINT_HIT_ONCE,
                    substrs=[' resolved, hit count = 1'])
