341 lines
17 KiB
Haskell
341 lines
17 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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module RainTypes where
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import Control.Monad.State
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import Data.Generics
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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 EvalConstants
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import Metadata
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import Pass
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import ShowCode
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import Types
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-- | A pass that records inferred types. Currently the only place where types are inferred is in seqeach\/pareach loops.
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recordInfNameTypes :: Data t => t -> PassM t
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recordInfNameTypes = everywhereM (mkM recordInfNameTypes')
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where
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recordInfNameTypes' :: A.Replicator -> PassM A.Replicator
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recordInfNameTypes' input@(A.ForEach m n e)
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= do arrType <- typeOfExpression e
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innerT <- case arrType of
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A.List t -> return t
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_ -> diePC m $ formatCode "Cannot do a foreach loop over a non-list type: %" arrType
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defineName n A.NameDef {A.ndMeta = m, A.ndName = A.nameName n, A.ndOrigName = A.nameName n,
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A.ndNameType = A.VariableName, A.ndType = (A.Declaration m innerT),
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A.ndAbbrevMode = A.Original, A.ndPlacement = A.Unplaced}
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return input
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recordInfNameTypes' r = return r
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everywhereASTM :: (Data s, Data t) => (s -> PassM s) -> t -> PassM t
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everywhereASTM f = doGeneric `extM` (doSpecific f)
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where
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doGeneric :: Data t => t -> PassM t
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doGeneric = makeGeneric (everywhereASTM f)
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doSpecific :: Data t => (t -> PassM t) -> t -> PassM t
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doSpecific f x = (doGeneric x >>= f)
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-- | Folds all constants.
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constantFoldPass :: Data t => t -> PassM t
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constantFoldPass = everywhereASTM doExpression
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where
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doExpression :: A.Expression -> PassM A.Expression
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doExpression = (liftM (\(x,_,_) -> x)) . constantFold
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-- | Annotates all integer literal types
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annnotateIntLiteralTypes :: Data t => t -> PassM t
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annnotateIntLiteralTypes = everywhereASTM doExpression
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where
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--Function is separated out to easily provide the type description of Integer
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powOf2 :: Integer -> Integer
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powOf2 x = 2 ^ x
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doExpression :: A.Expression -> PassM A.Expression
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doExpression (A.Literal m t (A.IntLiteral m' s))
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= do t' <-
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if (t == A.Int64) then --it's a signed literal
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(if (n >= powOf2 63 || n < (-(powOf2 63)))
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then dieP m $ "Signed integer literal too large to fit into 64 bits: " ++ s
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else
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if (n < (-(powOf2 31)) || n >= powOf2 31)
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then return A.Int64
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else
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if (n < (-(powOf2 15)) || n >= powOf2 15)
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then return A.Int32
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else
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if (n < (-(powOf2 7)) || n >= powOf2 7)
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then return A.Int16
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else return A.Int8
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)
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else
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dieP m $ "Unsigned literals currently unsupported"
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return $ A.Literal m t' (A.IntLiteral m' s)
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where
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n :: Integer
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n = read s
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doExpression e = return e
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-- | A pass that finds all the 'A.ProcCall' and 'A.FunctionCall' in the AST, and checks that the actual parameters are valid inputs, given the 'A.Formal' parameters in the process's type
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matchParamPass :: Data t => t -> PassM t
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matchParamPass = everywhereM ((mkM matchParamPassProc) `extM` matchParamPassFunc)
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where
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--Picks out the parameters of a process call, checks the number is correct, and maps doParam over them
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matchParamPassProc :: A.Process -> PassM A.Process
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matchParamPassProc (A.ProcCall m n actualParams)
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= do def <- lookupNameOrError n $ dieP m ("Process name is unknown: \"" ++ (show $ A.nameName n) ++ "\"")
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case A.ndType def of
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A.Proc _ _ expectedParams _ ->
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if (length expectedParams) == (length actualParams)
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then do transActualParams <- mapM (doParam m (A.nameName n)) (zip3 [0..] expectedParams actualParams)
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return $ A.ProcCall m n transActualParams
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else dieP m $ "Wrong number of parameters given to process call; expected: " ++ show (length expectedParams) ++ " but found: " ++ show (length actualParams)
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_ -> dieP m $ "You cannot run things that are not processes, such as: \"" ++ (show $ A.nameName n) ++ "\""
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matchParamPassProc p = return p
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--Picks out the parameters of a function call, checks the number is correct, and maps doExpParam over them
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matchParamPassFunc :: A.Expression -> PassM A.Expression
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matchParamPassFunc (A.FunctionCall m n actualParams)
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= do def <- lookupNameOrError n $ dieP m ("Function name is unknown: \"" ++ (show $ A.nameName n) ++ "\"")
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case A.ndType def of
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A.Function _ _ _ expectedParams _ ->
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if (length expectedParams) == (length actualParams)
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then do transActualParams <- mapM (doExpParam m (A.nameName n)) (zip3 [0..] expectedParams actualParams)
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return $ A.FunctionCall m n transActualParams
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else dieP m $ "Wrong number of parameters given to function call; expected: " ++ show (length expectedParams) ++ " but found: " ++ show (length actualParams)
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_ -> dieP m $ "Attempt to make a function call with something that is not a function: \"" ++ (show $ A.nameName n) ++ "\""
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matchParamPassFunc e = return e
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--Checks the type of a parameter (A.Actual), and inserts a cast if it is safe to do so
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doParam :: Meta -> String -> (Int,A.Formal, A.Actual) -> PassM A.Actual
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doParam m n (index, A.Formal formalAbbrev formalType formalName, A.ActualVariable _ _ v)
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= do actualType <- typeOfVariable v
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if (actualType == formalType)
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then return $ A.ActualVariable formalAbbrev formalType v
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else (liftM $ A.ActualExpression formalType) $ doCast index formalType actualType (A.ExprVariable (findMeta v) v )
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doParam m n (index, for@(A.Formal _ formalType _), A.ActualExpression _ e)
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= (liftM $ A.ActualExpression formalType) $ doExpParam m n (index, for, e)
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--Checks the type of a parameter (A.Expression), and inserts a cast if it is safe to do so
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doExpParam :: Meta -> String -> (Int, A.Formal, A.Expression) -> PassM A.Expression
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doExpParam m n (index, A.Formal formalAbbrev formalType formalName, e)
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= do actualType <- typeOfExpression e
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if (actualType == formalType)
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then return e
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else doCast index formalType actualType e
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doCast :: Int -> A.Type -> A.Type -> A.Expression -> PassM A.Expression
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doCast index = coerceType $ " for parameter (zero-based): " ++ (show index)
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--Adds a cast between two types if it is safe to do so, otherwise gives an error
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coerceType :: String -> A.Type -> A.Type -> A.Expression -> PassM A.Expression
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coerceType customMsg to from item
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= if isImplicitConversionRain from to
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then return $ A.Conversion (findMeta item) A.DefaultConversion to item
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else diePC (findMeta item) $ (liftM concat) $ sequence [formatCode "Could not perform implicit cast from supplied type: % to expected type: %" from to, return customMsg]
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-- | Checks the types in expressions
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checkExpressionTypes :: Data t => t -> PassM t
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checkExpressionTypes = everywhereASTM checkExpression
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where
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checkExpression :: A.Expression -> PassM A.Expression
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checkExpression e@(A.Dyadic m op lhs rhs)
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= do tlhs <- typeOfExpression lhs
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trhs <- typeOfExpression rhs
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if (tlhs == A.Time || trhs == A.Time) --Expressions with times can have asymmetric types, so we handle them specially:
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then case (validOpWithTime op tlhs trhs) of
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Nothing -> diePC m $ formatCode "Operator: \"%\" is not valid on types: \"%\" and \"%\"" op tlhs trhs
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Just (destLHS, destRHS) ->
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if (isImplicitConversionRain tlhs destLHS) && (isImplicitConversionRain trhs destRHS)
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then return $ A.Dyadic m op (convert destLHS tlhs lhs) (convert destRHS trhs rhs)
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else diePC m $ formatCode "Operator: \"%\" is not valid on types: \"%\" and \"%\" (implicit conversions not possible)" op tlhs trhs
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else
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if (tlhs == trhs)
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then (if validOpSameType op tlhs then return e else diePC m $ formatCode "Operator: \"%\" is not valid on type: \"%\"" op tlhs)
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else if (isIntegerType tlhs && isIntegerType trhs)
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then case (leastGeneralSharedTypeRain [tlhs,trhs]) of
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Nothing -> diePC m $ formatCode "Cannot find a suitable type to convert expression to, types are: % and %" tlhs trhs
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Just t -> if validOpSameType op t then return $ A.Dyadic m op (convert t tlhs lhs) (convert t trhs rhs) else diePC m $
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formatCode "Operator: \"%\" is not valid on type: \"%\"" op tlhs
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else --The operands are not equal, and are not integers, and neither of them is a time type. Therefore this must be an error:
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diePC m $ formatCode "Mis-matched types; no operator applies to types: % and %" tlhs trhs
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checkExpression e@(A.Monadic m op rhs)
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= do trhs <- typeOfExpression rhs
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if (op == A.MonadicMinus)
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then case trhs of
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A.Byte -> return $ A.Monadic m op $ convert A.Int16 trhs rhs
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A.UInt16 -> return $ A.Monadic m op $ convert A.Int32 trhs rhs
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A.UInt32 -> return $ A.Monadic m op $ convert A.Int64 trhs rhs
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A.UInt64 -> diePC m $ formatCode "Cannot apply unary minus to type: % because there is no type large enough to safely contain the result" trhs
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_ -> if (isIntegerType trhs) then return e else diePC m $ formatCode "Trying to apply unary minus to non-integer type: %" trhs
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else if (op == A.MonadicNot)
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then
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case trhs of
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A.Bool -> return e
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_ -> diePC m $ formatCode "Cannot apply unary not to non-boolean type: %" trhs
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else dieP m $ "Invalid Rain operator: \"" ++ show op ++ "\""
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checkExpression e@(A.Conversion m cm dest rhs)
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= do src <- typeOfExpression rhs
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if (src == dest)
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then return e
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else if isImplicitConversionRain src dest
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then return e
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else diePC m $ formatCode "Invalid cast from: % to: %" dest src
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checkExpression e = return e
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convert :: A.Type -> A.Type -> A.Expression -> A.Expression
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convert dest src e = if (dest == src)
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then e
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else A.Conversion (findMeta e) A.DefaultConversion dest e
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validOpSameType :: A.DyadicOp -> A.Type -> Bool
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validOpSameType A.Plus t = (isIntegerType t) || (t == A.Time)
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validOpSameType A.Minus t = (isIntegerType t) || (t == A.Time)
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validOpSameType A.Times t = isIntegerType t
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validOpSameType A.Div t = isIntegerType t
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validOpSameType A.Rem t = isIntegerType t
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validOpSameType A.Eq _ = True
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validOpSameType A.NotEq _ = True
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validOpSameType A.Less t = haveOrder t
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validOpSameType A.LessEq t = haveOrder t
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validOpSameType A.More t = haveOrder t
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validOpSameType A.MoreEq t = haveOrder t
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validOpSameType A.And A.Bool = True
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validOpSameType A.Or A.Bool = True
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validOpSameType _ _ = False
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-- | Takes an operator, the types of LHS and RHS, and returns Nothing if no cast will fix it,
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-- or Just (needTypeLHS,needTypeRHS) for what types will be okay
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validOpWithTime :: A.DyadicOp -> A.Type -> A.Type -> Maybe (A.Type,A.Type)
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validOpWithTime A.Times A.Time _ = Just (A.Time, A.Int64)
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validOpWithTime A.Times _ A.Time = Just (A.Int64, A.Time)
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validOpWithTime A.Div A.Time _ = Just (A.Time, A.Int64)
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--Any other operators involving Time are symmetric:
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validOpWithTime op tlhs trhs = if (tlhs == trhs && validOpSameType op tlhs) then Just (tlhs,trhs) else Nothing
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haveOrder :: A.Type -> Bool
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haveOrder t = (isIntegerType t) || (t == A.Time)
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-- | Checks the types in assignments
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checkAssignmentTypes :: Data t => t -> PassM t
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checkAssignmentTypes = everywhereASTM checkAssignment
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where
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checkAssignment :: A.Process -> PassM A.Process
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checkAssignment ass@(A.Assign m [v] (A.ExpressionList m' [e]))
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= do trhs <- typeOfExpression e
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tlhs <- typeOfVariable v
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if (tlhs == trhs)
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then return ass
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else do rhs' <- coerceType " in assignment" tlhs trhs e
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return $ A.Assign m [v] (A.ExpressionList m' [rhs'])
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checkAssignment (A.Assign m _ _) = dieInternal (Just m,"Rain checker found occam-style assignment")
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checkAssignment st = return st
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-- | Checks the types in if and while conditionals
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checkConditionalTypes :: Data t => t -> PassM t
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checkConditionalTypes t = (everywhereASTM checkWhile t) >>= (everywhereASTM checkIf)
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where
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checkWhile :: A.Process -> PassM A.Process
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checkWhile w@(A.While m exp _)
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= do t <- typeOfExpression exp
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if (t == A.Bool)
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then return w
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else dieP m "Expression in while conditional must be of boolean type"
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checkWhile p = return p
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checkIf :: A.Choice -> PassM A.Choice
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checkIf c@(A.Choice m exp _)
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= do t <- typeOfExpression exp
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if (t == A.Bool)
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then return c
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else dieP m "Expression in if conditional must be of boolean type"
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-- | Checks the types in inputs and outputs, including inputs in alts
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checkCommTypes :: Data t => t -> PassM t
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checkCommTypes p = (everywhereASTM checkInputOutput p) >>= (everywhereASTM checkAltInput)
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where
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checkInput :: A.Variable -> A.Variable -> Meta -> a -> PassM a
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checkInput chanVar destVar m p
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= do chanType <- typeOfVariable chanVar
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destType <- typeOfVariable destVar
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case chanType of
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A.Chan dir _ innerType ->
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if (dir == A.DirOutput)
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then dieP m $ "Tried to input from the writing end of a channel: " ++ show chanVar
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else
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if (innerType == destType)
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then return p
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else diePC m $ formatCode "Mis-matching types; channel: \"%\" has inner-type: % but destination variable: \"%\" has type: %"
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chanVar innerType destVar destType
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_ -> dieP m $ "Tried to input from a variable that is not of type channel: " ++ show chanVar
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checkInputOutput :: A.Process -> PassM A.Process
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checkInputOutput p@(A.Input m chanVar (A.InputSimple _ [A.InVariable _ destVar]))
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= checkInput chanVar destVar m p
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checkInputOutput p@(A.Output m chanVar [A.OutExpression m' srcExp])
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= do chanType <- typeOfVariable chanVar
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srcType <- typeOfExpression srcExp
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case chanType of
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A.Chan dir _ innerType ->
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if (dir == A.DirInput)
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then dieP m $ "Tried to output to the reading end of a channel: " ++ show chanVar
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else
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if (innerType == srcType)
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then return p
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else do castExp <- coerceType " for writing to channel" innerType srcType srcExp
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return $ A.Output m chanVar [A.OutExpression m' castExp]
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_ -> dieP m $ "Tried to output to a variable that is not of type channel: " ++ show chanVar
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checkInputOutput p = return p
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checkAltInput :: A.Alternative -> PassM A.Alternative
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checkAltInput a@(A.Alternative m chanVar (A.InputSimple _ [A.InVariable _ destVar]) body)
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= checkInput chanVar destVar m a
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checkAltInput a = return a
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-- | Checks the types in now and wait statements, and wait guards:
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checkGetTimeTypes :: Data t => t -> PassM t
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checkGetTimeTypes p = (everywhereASTM checkGetTime p) >>= (everywhereASTM checkTimeGuards)
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where
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checkGetTime :: A.Process -> PassM A.Process
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checkGetTime p@(A.GetTime m v)
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= do t <- typeOfVariable v
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case t of
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A.Time -> return p
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_ -> diePC m $ formatCode "Cannot store time in variable of type \"%\"" t
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checkGetTime p@(A.Wait m _ e)
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= do t <- typeOfExpression e
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case t of
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A.Time -> return p
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_ -> diePC m $ formatCode "Cannot wait with an expression of non-time type: \"%\"" t
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checkGetTime p = return p
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checkTimeGuards :: A.Alternative -> PassM A.Alternative
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checkTimeGuards g@(A.AlternativeWait m _ e _)
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= do t <- typeOfExpression e
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case t of
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A.Time -> return g
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_ -> diePC m $ formatCode "Cannot wait with an expression of non-time type: \"%\"" t
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checkTimeGuards g = return g
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