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.)
46 lines
1.5 KiB
Haskell
46 lines
1.5 KiB
Haskell
{-
|
|
Tock: a compiler for parallel languages
|
|
Copyright (C) 2007 University of Kent
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation, either version 2 of the License, or (at your
|
|
option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along
|
|
with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
-}
|
|
|
|
-- | Error handling and reporting.
|
|
module Errors where
|
|
|
|
import qualified AST as A
|
|
import Metadata
|
|
|
|
-- | Class of monads that can fail.
|
|
class Monad m => Die m where
|
|
-- | Fail, giving an error message.
|
|
die :: String -> m a
|
|
|
|
-- | Fail, giving a position and an error message.
|
|
dieP :: Die m => Meta -> String -> m a
|
|
dieP m s = die $ show m ++ ": " ++ s
|
|
|
|
-- | Wrapper around error that gives nicer formatting.
|
|
dieIO :: Monad m => String -> m a
|
|
dieIO s = error $ "\n\nError: " ++ s ++ "\n"
|
|
|
|
-- | Fail after an internal error.
|
|
dieInternal :: Monad m => String -> m a
|
|
dieInternal s = dieIO $ "Internal error: " ++ s
|
|
|
|
-- | Extract a value from a Maybe type, dying with the given error if it's Nothing.
|
|
checkJust :: Die m => String -> Maybe t -> m t
|
|
checkJust _ (Just v) = return v
|
|
checkJust err _ = die err
|