FromCore.hs

{-# LANGUAGE ConstraintKinds #-}

--
-- Copyright (c) 2009-2011, ERICSSON AB
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--     * Redistributions in binary form must reproduce the above copyright
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{-# LANGUAGE GADTs #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FunctionalDependencies #-}

module Feldspar.Compiler.Imperative.FromCore where


import Control.Monad.RWS

import Language.Syntactic
import Language.Syntactic.Constructs.Binding
import Language.Syntactic.Constructs.Binding.HigherOrder

import Feldspar.Core.Types
import Feldspar.Core.Interpretation
import Feldspar.Core.Constructs
import Feldspar.Core.Constructs.Binding
import Feldspar.Core.Frontend

import Feldspar.Compiler.Imperative.Representation (Module)
import Feldspar.Compiler.Imperative.Frontend hiding (Type)
import Feldspar.Compiler.Imperative.FromCore.Interpretation
import Feldspar.Compiler.Imperative.FromCore.Array ()
import Feldspar.Compiler.Imperative.FromCore.Binding ()
import Feldspar.Compiler.Imperative.FromCore.Condition ()
import Feldspar.Compiler.Imperative.FromCore.ConditionM ()
import Feldspar.Compiler.Imperative.FromCore.Error ()
import Feldspar.Compiler.Imperative.FromCore.FFI ()
import Feldspar.Compiler.Imperative.FromCore.Future ()
import Feldspar.Compiler.Imperative.FromCore.Literal ()
import Feldspar.Compiler.Imperative.FromCore.Loop ()
import Feldspar.Compiler.Imperative.FromCore.Mutable ()
import Feldspar.Compiler.Imperative.FromCore.MutableToPure ()
import Feldspar.Compiler.Imperative.FromCore.NoInline ()
import Feldspar.Compiler.Imperative.FromCore.Par ()
import Feldspar.Compiler.Imperative.FromCore.Primitive ()
import Feldspar.Compiler.Imperative.FromCore.Save ()
import Feldspar.Compiler.Imperative.FromCore.SizeProp ()
import Feldspar.Compiler.Imperative.FromCore.SourceInfo ()
import Feldspar.Compiler.Imperative.FromCore.Tuple ()

instance Compile FeldDomain FeldDomain
  where
    compileProgSym (C' a) = compileProgSym a
    compileExprSym (C' a) = compileExprSym a

instance Compile Empty FeldDomain
  where
    compileProgSym _ = error "Can't compile Empty"
    compileExprSym _ = error "Can't compile Empty"

compileProgTop :: (Compile dom dom, Project (CLambda Type) dom) =>
    String -> [Var] -> ASTF (Decor Info dom) a -> Mod
compileProgTop funname args (lam :$ body)
    | Just (SubConstr2 (Lambda v)) <- prjLambda lam
    = let ta  = argType $ infoType $ getInfo lam
          sa  = defaultSize ta
          var = mkVariable (compileTypeRep ta sa) v
       in compileProgTop funname (var:args) body
compileProgTop funname args a = Mod defs
  where
    ins      = reverse args
    info     = getInfo a
    outType  = compileTypeRep (infoType info) (infoSize info)
    outParam = Pointer outType "out"
    outLoc   = Ptr outType "out"
    results  = snd $ evalRWS (compileProg outLoc a) initReader initState
    Bl ds p  = block results
    defs     = def results ++ [ProcDf funname ins [outParam] (Block ds p)]

class    SyntacticFeld a => Compilable a internal | a -> internal
instance SyntacticFeld a => Compilable a ()
  -- TODO This class should be replaced by (Syntactic a FeldDomainAll) (or a
  --      similar alias) everywhere. The second parameter is not needed.

fromCore :: SyntacticFeld a => String -> a -> Module ()
fromCore funname
    = fromInterface
    . compileProgTop funname []
    . reifyFeld N32

-- | Create a list where each element represents the number of variables needed
-- to as arguments
buildInParamDescriptor :: SyntacticFeld a => a -> [Int]
buildInParamDescriptor = go . reifyFeld N32
  where
    go :: (Project (CLambda Type) dom) => ASTF (Decor info dom) a -> [Int]
    go (lam :$ body)
      | Just (SubConstr2 (Lambda _)) <- prjLambda lam
      = 1 : go body
  -- TODO the 1 above is valid as long as we represent tuples as structs
  -- When we convert a struct to a set of variables the 1 has to replaced
  -- with an implementation that calculates the apropriate value.
    go _ = []

numArgs :: SyntacticFeld a => a -> Int
numArgs = length . buildInParamDescriptor