36e7353ee7
NameType is only really needed in the parser, so this takes it out of NameDef, meaning that later passes defining names no longer need to set an arbitrary NameType for them. The parser gets slightly more complicated (because some productions now have to return a SpecType and a NameType too), but lots of other code gets simpler. The code that removed free names was the only thing outside the parser using NameType, and it now makes a more sensible decision based on the SpecType. Since unscoped names previously didn't have a SpecType at all, I've added an Unscoped constructor to it and arranged matters such that unscoped names now get a proper entry in csNames. Fixes #61.
87 lines
2.9 KiB
Haskell
87 lines
2.9 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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-- | 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
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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, [(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 (A.Direction, TLPChannel)
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tlpChannel m (A.Formal _ (A.Chan 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 == A.DirUnknown || dir == (tlpDir c))
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then return (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 _ _ 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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, ("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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