2c4ccfbf39
I've checked these all against the Darcs history using a script (check-copyright, in my misccode collection). Anything Neil or I did as part of our PhDs is copyright University of Kent; more recent work belongs to us, as appropriate.
95 lines
3.3 KiB
Haskell
95 lines
3.3 KiB
Haskell
{-
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Tock: a compiler for parallel languages
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Copyright (C) 2007, 2008, 2009 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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-- | Top-level process support.
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module TLP where
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import Control.Monad.State
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import Data.Generics (Data, Typeable)
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import Data.List
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import Data.Maybe
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import qualified AST as A
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import CompState
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import Errors
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import Metadata
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import Types
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import Utils
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data TLPChannel = TLPIn | TLPOut | TLPError
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deriving (Show, Eq, Typeable, Data)
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-- | Get the name of the TLP and the channels it uses.
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-- Fail if the process isn't using a valid interface.
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tlpInterface :: (CSMR m, Die m) => m (A.Name, [(Maybe A.Direction, TLPChannel)])
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tlpInterface
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= do mainLocals <- getCompState >>* csMainLocals
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when (null mainLocals) $
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dieReport (Nothing, "No main process found")
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let (_, (mainName, _)) = head mainLocals
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st <- specTypeOfName mainName
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(m, formals) <-
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case st of
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A.Proc m _ fs _ -> return (m, fs)
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_ -> dieP (findMeta mainName) "Last definition is not a PROC"
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chans <- mapM (tlpChannel m) formals
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let chanIds = map snd chans
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when (nub chanIds /= chanIds) $
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dieP (findMeta mainName) "Channels used more than once in TLP"
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return (mainName, chans)
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where
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tlpChannel :: (CSMR m, Die m) => Meta -> A.Formal -> m (Maybe A.Direction, TLPChannel)
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tlpChannel m (A.Formal _ (A.ChanEnd dir _ _) n)
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= do def <- lookupName n
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let origN = A.ndOrigName def
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case lookup origN tlpChanNames of
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Just c ->
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if dir == (tlpDir c)
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then return (Just dir, c)
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else dieP m $ "TLP formal " ++ show n ++ " has wrong direction for its name"
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_ -> dieP m $ "TLP formal " ++ show n ++ " has unrecognised name"
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tlpChannel m (A.Formal _ (A.Chan _ _) n)
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= do def <- lookupName n
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let origN = A.ndOrigName def
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case lookup origN tlpChanNames of
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Just c ->
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return (Nothing, c)
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_ -> dieP m $ "TLP formal " ++ show n ++ " has unrecognised name"
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tlpChannel m (A.Formal _ _ n)
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= dieP m $ "TLP formal " ++ show n ++ " has unrecognised type"
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tlpDir :: TLPChannel -> A.Direction
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tlpDir TLPIn = A.DirInput
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tlpDir TLPOut = A.DirOutput
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tlpDir TLPError = A.DirOutput
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tlpChanNames :: [(String, TLPChannel)]
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tlpChanNames
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= [ ("in", TLPIn)
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, ("kb", TLPIn)
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, ("kyb", TLPIn)
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, ("keyb", TLPIn)
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, ("keyboard", TLPIn)
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, ("out", TLPOut)
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, ("scr", TLPOut)
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, ("screen", TLPOut)
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, ("err", TLPError)
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, ("error", TLPError)
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]
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