{-# 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
CostCentreState forall a. FastStringEnv a
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.
getCCIndex :: FastString
           -> CostCentreState
           -> (CostCentreIndex, CostCentreState)
getCCIndex :: FastString -> CostCentreState -> (CostCentreIndex, CostCentreState)
getCCIndex FastString
nm (CostCentreState FastStringEnv Int
m) =
    (Int -> CostCentreIndex
CostCentreIndex Int
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m')
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