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|
{-# LANGUAGE PatternGuards #-}
----------------------------------------------------------------------
-- |
-- Module : Optimize
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/09/16 13:56:13 $
-- > CVS $Author: aarne $
-- > CVS $Revision: 1.18 $
--
-- Top-level partial evaluation for GF source modules.
-----------------------------------------------------------------------------
module GF.Compile.Optimize (optimizeModule) where
import GF.Grammar.Grammar
import GF.Infra.Ident
import GF.Infra.Modules
import GF.Grammar.PrGrammar
import GF.Grammar.Macros
import GF.Grammar.Lookup
import GF.Grammar.Predef
import GF.Compile.Refresh
import GF.Compile.Compute
import GF.Compile.BackOpt
import GF.Compile.CheckGrammar
import GF.Compile.Update
import GF.Data.Operations
import GF.Infra.CheckM
import GF.Infra.Option
import Control.Monad
import Data.List
import qualified Data.Set as Set
import Debug.Trace
-- conditional trace
prtIf :: (Print a) => Bool -> a -> a
prtIf b t = if b then trace (" " ++ prt t) t else t
-- | partial evaluation of concrete syntax. AR 6\/2001 -- 16\/5\/2003 -- 5\/2\/2005.
type EEnv = () --- not used
-- only do this for resource: concrete is optimized in gfc form
optimizeModule :: Options -> ([SourceModule],EEnv) -> SourceModule -> Err (SourceModule,EEnv)
optimizeModule opts mse@(ms,eenv) mo@(_,mi)
| mstatus mi == MSComplete && isModRes mi = do
(mo1,_) <- evalModule oopts mse mo
let mo2 = shareModule optim mo1
return (mo2,eenv)
| otherwise = evalModule oopts mse mo
where
oopts = opts `addOptions` flagsModule mo
optim = flag optOptimizations oopts
evalModule :: Options -> ([SourceModule],EEnv) -> SourceModule -> Err (SourceModule,EEnv)
evalModule oopts (ms,eenv) mo@(name,m0)
| mstatus m0 == MSComplete =
case mtype m0 of
_ | isModRes m0 -> do
let deps = allOperDependencies name (jments m0)
ids <- topoSortOpers deps
MGrammar (mod' : _) <- foldM evalOp gr ids
return $ (mod',eenv)
MTConcrete a -> do
js' <- mapMTree (evalCncInfo oopts gr name a) (jments m0)
return $ ((name,replaceJudgements m0 js'),eenv)
_ -> return $ (mo,eenv)
| otherwise = return $ (mo,eenv)
where
gr0 = MGrammar $ ms
gr = MGrammar $ mo : ms
evalOp g@(MGrammar ((_,m) : _)) i = do
info <- lookupTree prt i $ jments m
info' <- evalResInfo oopts gr (i,info)
return $ updateRes g name i info'
-- | only operations need be compiled in a resource, and this is local to each
-- definition since the module is traversed in topological order
evalResInfo :: Options -> SourceGrammar -> (Ident,Info) -> Err Info
evalResInfo oopts gr (c,info) = case info of
ResOper pty pde -> eIn "operation" $ do
pde' <- case pde of
Yes de | optres -> liftM yes $ comp de
_ -> return pde
return $ ResOper pty pde'
_ -> return info
where
comp = if optres then computeConcrete gr else computeConcreteRec gr
eIn cat = errIn ("Error optimizing" +++ cat +++ prt c +++ ":")
optim = flag optOptimizations oopts
optres = OptExpand `Set.member` optim
evalCncInfo ::
Options -> SourceGrammar -> Ident -> Ident -> (Ident,Info) -> Err Info
evalCncInfo opts gr cnc abs (c,info) = do
seq (prtIf (verbAtLeast opts Verbose) c) $ return ()
errIn ("optimizing" +++ prt c) $ case info of
CncCat ptyp pde ppr -> do
pde' <- case (ptyp,pde) of
(Yes typ, Yes de) ->
liftM yes $ pEval ([(varStr, typeStr)], typ) de
(Yes typ, Nope) ->
liftM yes $ mkLinDefault gr typ >>= partEval noOptions gr ([(varStr, typeStr)],typ)
(May b, Nope) ->
return $ May b
_ -> return pde -- indirection
ppr' <- liftM yes $ evalPrintname gr c ppr (yes $ K $ prt c)
return (CncCat ptyp pde' ppr')
CncFun (mt@(Just (_,ty@(cont,val)))) pde ppr -> --trace (prt c) $
eIn ("linearization in type" +++ prt (mkProd (cont,val,[])) ++++ "of function") $ do
pde' <- case pde of
Yes de -> do
liftM yes $ pEval ty de
_ -> return pde
ppr' <- liftM yes $ evalPrintname gr c ppr pde'
return $ CncFun mt pde' ppr' -- only cat in type actually needed
_ -> return info
where
pEval = partEval opts gr
eIn cat = errIn ("Error optimizing" +++ cat +++ prt c +++ ":")
-- | the main function for compiling linearizations
partEval :: Options -> SourceGrammar -> (Context,Type) -> Term -> Err Term
partEval opts gr (context, val) trm = errIn ("parteval" +++ prt_ trm) $ do
let vars = map fst context
args = map Vr vars
subst = [(v, Vr v) | v <- vars]
trm1 = mkApp trm args
trm2 <- computeTerm gr subst trm1
trm3 <- if rightType trm2
then computeTerm gr subst trm2
else recordExpand val trm2 >>= computeTerm gr subst
return $ mkAbs vars trm3
where
-- don't eta expand records of right length (correct by type checking)
rightType (R rs) = case val of
RecType ts -> length rs == length ts
_ -> False
rightType _ = False
-- here we must be careful not to reduce
-- variants {{s = "Auto" ; g = N} ; {s = "Wagen" ; g = M}}
-- {s = variants {"Auto" ; "Wagen"} ; g = variants {N ; M}} ;
recordExpand :: Type -> Term -> Err Term
recordExpand typ trm = case unComputed typ of
RecType tys -> case trm of
FV rs -> return $ FV [R [assign lab (P r lab) | (lab,_) <- tys] | r <- rs]
_ -> return $ R [assign lab (P trm lab) | (lab,_) <- tys]
_ -> return trm
-- | auxiliaries for compiling the resource
mkLinDefault :: SourceGrammar -> Type -> Err Term
mkLinDefault gr typ = do
case unComputed typ of
RecType lts -> mapPairsM mkDefField lts >>= (return . Abs varStr . R . mkAssign)
_ -> liftM (Abs varStr) $ mkDefField typ
---- _ -> prtBad "linearization type must be a record type, not" typ
where
mkDefField typ = case unComputed typ of
Table p t -> do
t' <- mkDefField t
let T _ cs = mkWildCases t'
return $ T (TWild p) cs
Sort s | s == cStr -> return $ Vr varStr
QC q p -> lookupFirstTag gr q p
RecType r -> do
let (ls,ts) = unzip r
ts' <- mapM mkDefField ts
return $ R $ [assign l t | (l,t) <- zip ls ts']
_ | Just _ <- isTypeInts typ -> return $ EInt 0 -- exists in all as first val
_ -> prtBad "linearization type field cannot be" typ
-- | Form the printname: if given, compute. If not, use the computed
-- lin for functions, cat name for cats (dispatch made in evalCncDef above).
--- We cannot use linearization at this stage, since we do not know the
--- defaults we would need for question marks - and we're not yet in canon.
evalPrintname :: SourceGrammar -> Ident -> MPr -> Perh Term -> Err Term
evalPrintname gr c ppr lin =
case ppr of
Yes pr -> comp pr
_ -> case lin of
Yes t -> return $ K $ clean $ prt $ oneBranch t ---- stringFromTerm
_ -> return $ K $ prt c ----
where
comp = computeConcrete gr
oneBranch t = case t of
Abs _ b -> oneBranch b
R (r:_) -> oneBranch $ snd $ snd r
T _ (c:_) -> oneBranch $ snd c
V _ (c:_) -> oneBranch c
FV (t:_) -> oneBranch t
C x y -> C (oneBranch x) (oneBranch y)
S x _ -> oneBranch x
P x _ -> oneBranch x
Alts (d,_) -> oneBranch d
_ -> t
--- very unclean cleaner
clean s = case s of
'+':'+':' ':cs -> clean cs
'"':cs -> clean cs
c:cs -> c: clean cs
_ -> s
|
