71 lines
2.7 KiB
Haskell
71 lines
2.7 KiB
Haskell
{-
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Tock: a compiler for parallel languages
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Copyright (C) 2007 University of Kent
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 2 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>.
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-}
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-- | Passes associated with the backends
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module BackendPasses where
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import Control.Monad.State
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import Data.Generics
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import qualified Data.Set as Set
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import qualified AST as A
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import CompState
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import Pass
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-- | Identify processes that we'll need to compute the stack size of.
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identifyParProcs :: Pass
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identifyParProcs = everywhereM (mkM doProcess)
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where
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doProcess :: A.Process -> PassM A.Process
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doProcess p@(A.Par _ _ s) = findProcs s >> return p
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doProcess p = return p
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findProcs :: A.Structured -> PassM ()
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findProcs (A.Rep _ _ s) = findProcs s
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findProcs (A.Spec _ _ s) = findProcs s
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findProcs (A.ProcThen _ _ s) = findProcs s
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findProcs (A.Several _ ss) = sequence_ $ map findProcs ss
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findProcs (A.OnlyP _ (A.ProcCall _ n _))
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= modify (\cs -> cs { csParProcs = Set.insert n (csParProcs cs) })
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transformWaitFor :: Data t => t -> PassM t
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transformWaitFor = everywhereM (mkM doAlt)
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where
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doAlt :: A.Process -> PassM A.Process
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doAlt a@(A.Alt m pri s)
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= do (a',(specs,code)) <- runStateT (everywhereM (mkM doWaitFor) a) ([],[])
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if (null specs && null code)
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then return a
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else return $ A.Seq m $ foldr addSpec (A.Several m (code ++ [A.OnlyP m a'])) specs
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doAlt p = return p
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addSpec :: (A.Structured -> A.Structured) -> A.Structured -> A.Structured
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addSpec spec inner = spec inner
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doWaitFor :: A.Alternative -> StateT ([A.Structured -> A.Structured], [A.Structured]) PassM A.Alternative
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doWaitFor a@(A.AlternativeWait m A.WaitFor e p)
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= do (specs, init) <- get
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id <- lift $ makeNonce "waitFor"
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let n = (A.Name m A.VariableName id)
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let var = A.Variable m n
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put (specs ++ [A.Spec m (A.Specification m n (A.Declaration m A.Time Nothing))],
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init ++ [A.OnlyP m $ A.GetTime m var, A.OnlyP m $ A.Assign m [var] $ A.ExpressionList m [A.Dyadic m A.Plus (A.ExprVariable m var) e]])
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return $ A.AlternativeWait m A.WaitUntil (A.ExprVariable m var) p
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doWaitFor a = return a
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