"""
Test lldb data formatter subsystem.
"""

from __future__ import print_function


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


class LibCxxFunctionTestCase(TestBase):

    mydir = TestBase.compute_mydir(__file__)

    # Run frame var for a variable twice. Verify we do not hit the cache
    # the first time but do the second time.
    def run_frame_var_check_cache_use(self, variable, result_to_match, skip_find_function=False):
        self.runCmd("log timers reset")
        self.expect("frame variable " + variable,
                    substrs=[variable + " =  " + result_to_match])
        if not skip_find_function:
          self.expect("log timers dump",
                   substrs=["lldb_private::CompileUnit::FindFunction"])

        self.runCmd("log timers reset")
        self.expect("frame variable " + variable,
                    substrs=[variable + " =  " + result_to_match])
        self.expect("log timers dump",
                   matching=False,
                   substrs=["lldb_private::CompileUnit::FindFunction"])


    @add_test_categories(["libc++"])
    def test(self):
        """Test that std::function as defined by libc++ is correctly printed by LLDB"""
        self.build()
        self.runCmd("file " + self.getBuildArtifact("a.out"), CURRENT_EXECUTABLE_SET)

        bkpt = self.target().FindBreakpointByID(
            lldbutil.run_break_set_by_source_regexp(
                self, "Set break point at this line."))

        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'])

        self.run_frame_var_check_cache_use("foo2_f", "Lambda in File main.cpp at Line 30")

        lldbutil.continue_to_breakpoint(self.process(), bkpt)

        self.run_frame_var_check_cache_use("add_num2_f", "Lambda in File main.cpp at Line 21")

        lldbutil.continue_to_breakpoint(self.process(), bkpt)

        self.run_frame_var_check_cache_use("f2", "Lambda in File main.cpp at Line 43")
        self.run_frame_var_check_cache_use("f3", "Lambda in File main.cpp at Line 47", True)
        # TODO reenable this case when std::function formatter supports
        # general callable object case.
        #self.run_frame_var_check_cache_use("f4", "Function in File main.cpp at Line 16")

        # These cases won't hit the cache at all but also don't require
        # an expensive lookup.
        self.expect("frame variable f1",
                    substrs=['f1 =  Function = foo(int, int)'])

        self.expect("frame variable f5",
                    substrs=['f5 =  Function = Bar::add_num(int) const'])
