    {-# LANGUAGE DeriveDataTypeable #-}
    {-# LANGUAGE GeneralizedNewtypeDeriving #-}
    module GHC.Types.CostCentre.State
       ( CostCentreState
       , newCostCentreState
       , CostCentreIndex
       , unCostCentreIndex
       , getCCIndex
       )
    where

    import GHC.Prelude
    import GHC.Data.FastString
    import GHC.Data.FastString.Env

    import Data.Data
    import GHC.Utils.Binary

    -- | Per-module state for tracking cost centre indices.
    --
    -- See documentation of 'GHC.Types.CostCentre.cc_flavour' for more details.
    newtype CostCentreState = CostCentreState (FastStringEnv Int)

    -- | Initialize cost centre state.
    newCostCentreState :: CostCentreState
    newCostCentreState :: CostCentreState
    newCostCentreState = FastStringEnv Int -> CostCentreState
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    emptyFsEnv

    -- | An index into a given cost centre module,name,flavour set
    newtype CostCentreIndex = CostCentreIndex { CostCentreIndex -> Int
    unCostCentreIndex :: Int }
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    -- | Get a new index for a given cost centre name.
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    getCCIndex :: FastString -> CostCentreState -> (CostCentreIndex, CostCentreState)
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