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Added some comments to declareSizesArray

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This commit is contained in:
Neil Brown 2008-03-06 18:23:02 +00:00
parent c3e1a32909
commit 41eda81ee7
1 changed files with 8 additions and 0 deletions
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8
backends/BackendPasses.hs
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@ -131,13 +131,19 @@ declareSizesArray = doGeneric `ext1M` doStructured
A.IsExpr _ _ _ (A.ExprVariable _ v) -> return v
-- TODO reshapes
_ -> dieP m $ "Could not handle unknown array spec: " ++ pshow spec
-- Find the inner most variable (i.e. strip all the array subscripts)
let innerV = findInnerVar outerV
-- Figure out the _sizes variable to abbreviate; either the _sizes variable corresponding
-- to the abbreviation source (for everything but record fields)
-- or the globally declared record field _sizes constant
varSrcSizes <- case innerV of
A.Variable _ srcN -> return (A.Variable m' $ append_sizes srcN)
A.SubscriptedVariable _ (A.SubscriptField _ fieldName) recordV ->
do A.Record recordName <- typeOfVariable recordV
return (A.Variable m' $ A.Name m' A.VariableName $ A.nameName recordName ++ A.nameName fieldName ++ "_sizes")
-- Get the dimensions of the source variable:
(A.Array srcDs _) <- typeOfVariable innerV
-- Calculate the correct subscript into the source _sizes variable to get to the dimensions for the destination:
let sizeDiff = length srcDs - length ds
subSrcSizeVar = A.SubscriptedVariable m' (A.SubscriptFrom m' $ makeConstant m' sizeDiff) varSrcSizes
sizeSpecType = A.Is m' A.ValAbbrev (A.Array [A.Dimension $ length ds] A.Int) subSrcSizeVar
@ -145,6 +151,8 @@ declareSizesArray = doGeneric `ext1M` doStructured
s' <- doStructured s
defineSizesName m' (append_sizes n) sizeSpecType
return (A.Spec m sp $ A.Spec m sizeSpec $ s')
-- Sizes are statically known; very straight-forward
else do let n_sizes = append_sizes n
sizeSpecType = makeStaticSizeSpec m' n_sizes ds
sizeSpec = A.Specification m' n_sizes sizeSpecType