# Copyright 2018 Google, Inc.
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# Authors: Gabe Black

from m5.SimObject import SimObject

# This class represents the systemc kernel. There should be exactly one in the
# simulation. It receives gem5 SimObject lifecycle callbacks (init, regStats,
# etc.) and manages the lifecycle of the systemc simulation accordingly.
# It also acts as a collecting point for systemc related control functionality.
class SystemC_Kernel(SimObject):
    type = 'SystemC_Kernel'
    cxx_class = 'sc_gem5::Kernel'
    cxx_header = 'systemc/core/kernel.hh'

    # The sc_time type won't exist until some setup code runs in gem5.
    try:
        from _m5.systemc import sc_time
    except:
        pass

    class ScMainResult(object):
        def __init__(self, code, message):
            self.code = code
            self.message = message

    def sc_main(self, *args):
        '''Call the systemc sc_main function with the given string args'''
        from _m5.systemc import sc_main
        sc_main(*args)

    def sc_main_result(self):
        '''Retrieve and return the results of running sc_main'''
        from _m5.systemc import sc_main_result_code, sc_main_result_str
        return SystemC_Kernel.ScMainResult(
                sc_main_result_code(), sc_main_result_str());

# This class represents systemc sc_object instances in python config files. It
# inherits from SimObject in python, but the c++ version, sc_core::sc_object,
# doesn't inherit from gem5's c++ SimObject class.
class SystemC_ScObject(SimObject):
    type = 'SystemC_ScObject'
    abstract = True
    cxx_class = 'sc_core::sc_object'
    cxx_header = 'systemc/ext/core/sc_object.hh'

    # Clear cxx_base to stop the c++ binding code from assuming
    # sc_core::sc_object inherits from SimObject, even though SystemC_ScObject
    # does on the python side.
    cxx_base = None

    # Hide the cxx_exports from SimObject since we don't inherit from
    # SimObject on the c++ side and so don't have those methods to call down
    # into.
    locals().update({
        method.name: (lambda *a, **k: None) for method in SimObject.cxx_exports
    })

class SystemC_ScModule(SystemC_ScObject):
    type = 'SystemC_ScModule'
    abstract = True
    cxx_class = 'sc_core::sc_module'
    cxx_header = 'systemc/ext/core/sc_module.hh'

try:
    import _m5
except:
    pass
else:
    import _m5.systemc
    _m5.systemc.python_ready()