Options.hs

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{-# LANGUAGE TypeSynonymInstances #-}

module Feldspar.Compiler.Backend.C.Options where

import Data.Typeable

import Feldspar.Compiler.Imperative.Representation
import Feldspar.Compiler.Imperative.Frontend hiding (UserType, Type, Var)
import Feldspar.Compiler.Backend.C.Plugin.AllocationEliminator

data Options =
    Options
    { platform          :: Platform
    , unroll            :: UnrollStrategy
    , debug             :: DebugOption
    , memoryInfoVisible :: Bool
    , rules             :: [Rule]
    } deriving (Eq, Show)

data UnrollStrategy = NoUnroll | Unroll Int
    deriving (Eq, Show)

data DebugOption = NoDebug | NoPrimitiveInstructionHandling
    deriving (Eq, Show)

data Platform = Platform {
    name            :: String,
    types           :: [(Type, String, String)],
    values          :: [(Type, ShowValue)],
    includes        :: [String],
    platformRules   :: [Rule],
    isRestrict      :: IsRestrict
} deriving (Eq, Show)

type ShowValue = Constant AllocationEliminatorSemanticInfo -> String

instance Eq ShowValue where
    (==) _ _ = True

instance Show ShowValue where
    show _ = "<<ShowValue>>"

data IsRestrict = Restrict | NoRestrict
    deriving (Show,Eq)

-- * Actions and rules

data Action t
    = Replace t
    | Propagate Rule
    | WithId (Int -> [Action t])
    | WithOptions (Options -> [Action t])
  deriving Typeable

data Rule where
    Rule :: (Typeable t) => (t -> [Action t]) -> Rule

instance Show Rule where
    show _ = "Transformation rule."
    
instance Eq Rule where
    _ == _ = False

rule :: (Interface t, Typeable (Repr t)) => (t -> [Action (Repr t)]) -> Rule
rule f = Rule $ \x -> f $ toInterface x

replaceWith :: (Interface t) => t -> Action (Repr t)
replaceWith = Replace . fromInterface

propagate :: (Interface t, Typeable (Repr t)) => (t -> [Action (Repr t)]) -> Action t'
propagate = Propagate . rule