module Language.PureScript.Optimizer.Inliner (
inlineVariables,
inlineOperator,
inlineCommonOperators,
etaConvert,
unThunk,
evaluateIifes
) where
import Data.Maybe (fromMaybe)
import Language.PureScript.CodeGen.JS.AST
import Language.PureScript.CodeGen.Common (identToJs)
import Language.PureScript.Optimizer.Common
import Language.PureScript.Names
import qualified Language.PureScript.Constants as C
shouldInline :: JS -> Bool
shouldInline (JSVar _) = True
shouldInline (JSNumericLiteral _) = True
shouldInline (JSStringLiteral _) = True
shouldInline (JSBooleanLiteral _) = True
shouldInline (JSAccessor _ val) = shouldInline val
shouldInline (JSIndexer index val) = shouldInline index && shouldInline val
shouldInline _ = False
etaConvert :: JS -> JS
etaConvert = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSBlock [JSReturn (JSApp (JSFunction Nothing idents block@(JSBlock body)) args)])
| all shouldInline args &&
not (any (`isRebound` block) (map JSVar idents)) &&
not (any (`isRebound` block) args)
= JSBlock (map (replaceIdents (zip idents args)) body)
convert (JSFunction Nothing [] (JSBlock [JSReturn (JSApp fn [])])) = fn
convert js = js
unThunk :: JS -> JS
unThunk = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSBlock []) = JSBlock []
convert (JSBlock jss) =
case last jss of
JSReturn (JSApp (JSFunction Nothing [] (JSBlock body)) []) -> JSBlock $ init jss ++ body
_ -> JSBlock jss
convert js = js
evaluateIifes :: JS -> JS
evaluateIifes = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp (JSFunction Nothing [] (JSBlock [JSReturn ret])) []) = ret
convert js = js
inlineVariables :: JS -> JS
inlineVariables = everywhereOnJS $ removeFromBlock go
where
go :: [JS] -> [JS]
go [] = []
go (JSVariableIntroduction var (Just js) : sts)
| shouldInline js && not (any (isReassigned var) sts) && not (any (isRebound js) sts) && not (any (isUpdated var) sts) =
go (map (replaceIdent var js) sts)
go (s:sts) = s : go sts
inlineOperator :: (String, String) -> (JS -> JS -> JS) -> JS -> JS
inlineOperator (m, op) f = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp (JSApp op' [x]) [y]) | isOp op' = f x y
convert other = other
isOp (JSAccessor longForm (JSVar m')) = m == m' && longForm == identToJs (Op op)
isOp (JSIndexer (JSStringLiteral op') (JSVar m')) = m == m' && op == op'
isOp _ = False
inlineCommonOperators :: JS -> JS
inlineCommonOperators = applyAll $
[ binary C.numNumber (C.+) Add
, binary C.numNumber (C.-) Subtract
, binary C.numNumber (C.*) Multiply
, binary C.numNumber (C./) Divide
, binary C.numNumber (C.%) Modulus
, unary C.numNumber C.negate Negate
, binary C.ordNumber (C.<) LessThan
, binary C.ordNumber (C.>) GreaterThan
, binary C.ordNumber (C.<=) LessThanOrEqualTo
, binary C.ordNumber (C.>=) GreaterThanOrEqualTo
, binary C.eqNumber (C.==) EqualTo
, binary C.eqNumber (C./=) NotEqualTo
, binary C.eqString (C.==) EqualTo
, binary C.eqString (C./=) NotEqualTo
, binary C.eqBoolean (C.==) EqualTo
, binary C.eqBoolean (C./=) NotEqualTo
, binary C.semigroupString (C.<>) Add
, binary C.semigroupString (C.++) Add
, binaryFunction C.bitsNumber C.shl ShiftLeft
, binaryFunction C.bitsNumber C.shr ShiftRight
, binaryFunction C.bitsNumber C.zshr ZeroFillShiftRight
, binary C.bitsNumber (C..&.) BitwiseAnd
, binary C.bitsNumber (C..|.) BitwiseOr
, binary C.bitsNumber (C..^.) BitwiseXor
, unary C.bitsNumber C.complement BitwiseNot
, binary C.boolLikeBoolean (C.&&) And
, binary C.boolLikeBoolean (C.||) Or
, unary C.boolLikeBoolean C.not Not
] ++
[ fn | i <- [0..10], fn <- [ mkFn i, runFn i ] ]
where
binary :: String -> String -> BinaryOperator -> JS -> JS
binary dictName opString op = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp (JSApp (JSApp fn [dict]) [x]) [y]) | isOp fn && isOpDict dictName dict = JSBinary op x y
convert other = other
isOp (JSAccessor longForm (JSAccessor prelude (JSVar _))) = prelude == C.prelude && longForm == identToJs (Op opString)
isOp (JSIndexer (JSStringLiteral op') (JSVar prelude)) = prelude == C.prelude && opString == op'
isOp _ = False
binaryFunction :: String -> String -> BinaryOperator -> JS -> JS
binaryFunction dictName fnName op = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp (JSApp (JSApp fn [dict]) [x]) [y]) | isOp fn && isOpDict dictName dict = JSBinary op x y
convert other = other
isOp (JSAccessor fnName' (JSVar prelude)) = prelude == C.prelude && fnName == fnName'
isOp _ = False
unary :: String -> String -> UnaryOperator -> JS -> JS
unary dictName fnName op = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp (JSApp fn [dict]) [x]) | isOp fn && isOpDict dictName dict = JSUnary op x
convert other = other
isOp (JSAccessor fnName' (JSVar prelude)) = prelude == C.prelude && fnName' == fnName
isOp _ = False
isOpDict dictName (JSAccessor prop (JSVar prelude)) = prelude == C.prelude && prop == dictName
isOpDict _ _ = False
mkFn :: Int -> JS -> JS
mkFn 0 = everywhereOnJS convert
where
convert :: JS -> JS
convert (JSApp mkFnN [JSFunction Nothing [_] (JSBlock js)]) | isNFn C.mkFn 0 mkFnN =
JSFunction Nothing [] (JSBlock js)
convert other = other
mkFn n = everywhereOnJS convert
where
convert :: JS -> JS
convert orig@(JSApp mkFnN [fn]) | isNFn C.mkFn n mkFnN =
case collectArgs n [] fn of
Just (args, js) -> JSFunction Nothing args (JSBlock js)
Nothing -> orig
convert other = other
collectArgs :: Int -> [String] -> JS -> Maybe ([String], [JS])
collectArgs 1 acc (JSFunction Nothing [oneArg] (JSBlock js)) | length acc == n 1 = Just (reverse (oneArg : acc), js)
collectArgs m acc (JSFunction Nothing [oneArg] (JSBlock [JSReturn ret])) = collectArgs (m 1) (oneArg : acc) ret
collectArgs _ _ _ = Nothing
isNFn :: String -> Int -> JS -> Bool
isNFn prefix n (JSVar name) = name == (prefix ++ show n)
isNFn prefix n (JSAccessor name (JSVar dataFunction)) | dataFunction == C.dataFunction = name == (prefix ++ show n)
isNFn _ _ _ = False
runFn :: Int -> JS -> JS
runFn n = everywhereOnJS convert
where
convert :: JS -> JS
convert js = fromMaybe js $ go n [] js
go :: Int -> [JS] -> JS -> Maybe JS
go 0 acc (JSApp runFnN [fn]) | isNFn C.runFn n runFnN && length acc == n = Just (JSApp fn acc)
go m acc (JSApp lhs [arg]) = go (m 1) (arg : acc) lhs
go _ _ _ = Nothing