c8d5a4ff40
The compiler itself is under the GPLv2+; the support code that gets built into user programs is under the LGPLv2+. This matches the existing practice for the KRoC project. (As with Occade, I've used the new GPLv3-style license header in the source files, though, since that avoids having to update the FSF's postal address.)
74 lines
2.4 KiB
Haskell
74 lines
2.4 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.Error
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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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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 :: (CSM m, Die m) => m (A.Name, [TLPChannel])
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tlpInterface
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= do ps <- get
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let mainName = snd $ head $ csMainLocals ps
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st <- specTypeOfName mainName
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formals <- case st of
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A.Proc _ _ fs _ -> return fs
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_ -> die "Last definition is not a PROC"
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chans <- mapM tlpChannel formals
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when ((nub chans) /= chans) $ die "Channels used more than once in TLP"
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return (mainName, chans)
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where
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tlpChannel :: (CSM m, Die m) => A.Formal -> m TLPChannel
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tlpChannel (A.Formal _ (A.Chan A.Byte) 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 -> return c
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_ -> die $ "TLP formal " ++ show n ++ " has unrecognised name"
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tlpChannel (A.Formal _ _ n)
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= die $ "TLP formal " ++ show n ++ " has unrecognised type"
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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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