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Rewrote transformRangeRep, stopping it requiring constants in ranges

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This commit is contained in:
Neil Brown 2008-03-20 12:40:07 +00:00
parent b20a7fcb0b
commit 8f51ead090
1 changed files with 8 additions and 15 deletions
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23
frontends/RainPasses.hs
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@ -196,6 +196,9 @@ transformEachRange = doGeneric `ext1M` doStructured
doStructured s = doGeneric s
-- | A pass that changes all the Rain range constructor expressions into the more general array constructor expressions
--
-- TODO make sure when the range has a bad order that an empty list is
-- returned
transformRangeRep :: Data t => t -> PassM t
transformRangeRep = doGeneric `extM` doExpression
where
@ -203,22 +206,12 @@ transformRangeRep = doGeneric `extM` doExpression
doGeneric = makeGeneric transformRangeRep
doExpression :: A.Expression -> PassM A.Expression
doExpression (A.ExprConstr _ (A.RangeConstr m t (A.Literal _ _ beginLit) (A.Literal _ _ endLit)))
= if (isJust $ checkIntegral beginLit) && (isJust $ checkIntegral endLit)
then transformRangeRep'' m (fromJust $ checkIntegral beginLit) (fromJust $ checkIntegral endLit)
else dieP m "Items in range constructor (x..y) are not integer literals"
where
transformRangeRep'' :: Meta -> Integer -> Integer -> PassM A.Expression
transformRangeRep'' m begin end
= if (end < begin)
then dieP m $ "End of range is before beginning: " ++ show begin ++ " > " ++ show end
else do A.Specification _ rep _ <- makeNonceVariable "rep_constr" m A.Int A.VariableName A.ValAbbrev
let count = end - begin + 1
doExpression (A.ExprConstr _ (A.RangeConstr m t begin end))
= do A.Specification _ rep _ <- makeNonceVariable "rep_constr" m A.Int A.VariableName A.ValAbbrev
let count = addOne $ subExprs end begin
return $ A.ExprConstr m $ A.RepConstr m t
(A.For m rep
(A.Literal m A.Int (A.IntLiteral m $ show begin))
(A.Literal m A.Int (A.IntLiteral m $ show count))
) (A.ExprVariable m $ A.Variable m rep)
(A.For m rep begin count)
(A.ExprVariable m $ A.Variable m rep)
doExpression e = doGeneric e
checkFunction :: Data t => t -> PassM t