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from m5.params import *
from m5.objects.BaseCPU import BaseCPU


class TraceCPU(BaseCPU):
    """Trace CPU model which replays traces generated in a prior simulation
    using DerivO3CPU or its derived classes. It interfaces with L1 caches.
    """

    type = "TraceCPU"
    cxx_header = "cpu/trace/trace_cpu.hh"
    cxx_class = "gem5::TraceCPU"

    @classmethod
    def memory_mode(cls):
        return "timing"

    @classmethod
    def require_caches(cls):
        return True

    def addPMU(self, pmu=None):
        pass

    @classmethod
    def support_take_over(cls):
        return True

    instTraceFile = Param.String("", "Instruction trace file")
    dataTraceFile = Param.String("", "Data dependency trace file")
    sizeStoreBuffer = Param.Unsigned(
        16, "Number of entries in the store buffer"
    )
    sizeLoadBuffer = Param.Unsigned(16, "Number of entries in the load buffer")
    sizeROB = Param.Unsigned(40, "Number of entries in the re-order buffer")

    # Frequency multiplier used to effectively scale the Trace CPU frequency
    # either up or down. Note that the Trace CPU's clock domain must also be
    # changed when frequency is scaled. A default value of 1.0 means the same
    # frequency as was used for generating the traces.
    freqMultiplier = Param.Float(
        1.0, "Multiplier scale the Trace CPU frequency up or down"
    )

    # Enable exiting when any one Trace CPU completes execution which is set to
    # false by default
    enableEarlyExit = Param.Bool(
        False, "Exit when any one Trace CPU completes execution"
    )

    # If progress msg interval is set to a non-zero value, it is treated as
    # the interval of committed instructions at which an info message is
    # printed.
    progressMsgInterval = Param.Unsigned(
        0,
        "Interval of committed "
        "instructions at which to print a"
        " progress msg",
    )