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 * Copyright (c) 2016-2017, 2020 ARM Limited
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 * modified or unmodified, in source code or in binary form.
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 * met: redistributions of source code must retain the above copyright
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 * this software without specific prior written permission.
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#ifndef __SIM_MATHEXPR_POWERMODEL_PM_HH__
#define __SIM_MATHEXPR_POWERMODEL_PM_HH__

#include <unordered_map>

#include "params/MathExprPowerModel.hh"
#include "sim/mathexpr.hh"
#include "sim/power/power_model.hh"

namespace gem5
{

GEM5_DEPRECATED_NAMESPACE(Stats, statistics);
namespace statistics
{
    class Info;
}

/**
 * A Equation power model. The power is represented as a combination
 * of some stats and automatic variables (like temperature).
 */
class MathExprPowerModel : public PowerModelState
{
  public:

    typedef MathExprPowerModelParams Params;
    MathExprPowerModel(const Params &p);

    /**
     * Get the dynamic power consumption.
     *
     * @return Power (Watts) consumed by this object (dynamic component)
     */
    double getDynamicPower() const override { return eval(dyn_expr); }

    /**
     * Get the static power consumption.
     *
     * @return Power (Watts) consumed by this object (static component)
     */
    double getStaticPower() const override { return eval(st_expr); }

    /**
     * Get the value for a variable (maps to a stat)
     *
     * @param name Name of the variable to retrieve the value from
     *
     * @return Power (Watts) consumed by this object (static component)
     */
    double getStatValue(const std::string & name) const;

    void startup() override;
    void regStats() override;

  private:
    /**
     * Evaluate an expression in the context of this object, fatal if
     * evaluation fails.
     *
     * @param expr Expression to evaluate
     * @return Value of expression.
     */
    double eval(const MathExpr &expr) const;

    // Math expressions for dynamic and static power
    MathExpr dyn_expr, st_expr;

    // Map that contains relevant stats for this power model
    std::unordered_map<std::string, const statistics::Info*> statsMap;
};

} // namespace gem5

#endif