{-# LANGUAGE GADTs #-}
{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}
module GHC.Cmm.Switch (
     SwitchTargets,
     mkSwitchTargets,
     switchTargetsCases, switchTargetsDefault, switchTargetsRange, switchTargetsSigned,
     mapSwitchTargets, switchTargetsToTable, switchTargetsFallThrough,
     switchTargetsToList, eqSwitchTargetWith,
     SwitchPlan(..),
     backendSupportsSwitch,
     createSwitchPlan,
  ) where
import GHC.Prelude
import GHC.Utils.Outputable
import GHC.Driver.Backend
import GHC.Utils.Panic
import GHC.Cmm.Dataflow.Label (Label)
import Data.Maybe
import Data.List (groupBy)
import Data.Function (on)
import qualified Data.Map as M
maxJumpTableHole :: Integer
maxJumpTableHole :: Integer
maxJumpTableHole = Integer
7
minJumpTableSize :: Int
minJumpTableSize :: Int
minJumpTableSize = Int
5
minJumpTableOffset :: Integer
minJumpTableOffset :: Integer
minJumpTableOffset = Integer
2
data SwitchTargets =
    SwitchTargets
        Bool                       
        (Integer, Integer)         
        (Maybe Label)              
        (M.Map Integer Label)      
    deriving (Int -> SwitchTargets -> ShowS
[SwitchTargets] -> ShowS
SwitchTargets -> String
(Int -> SwitchTargets -> ShowS)
-> (SwitchTargets -> String)
-> ([SwitchTargets] -> ShowS)
-> Show SwitchTargets
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> SwitchTargets -> ShowS
showsPrec :: Int -> SwitchTargets -> ShowS
$cshow :: SwitchTargets -> String
show :: SwitchTargets -> String
$cshowList :: [SwitchTargets] -> ShowS
showList :: [SwitchTargets] -> ShowS
Show, SwitchTargets -> SwitchTargets -> Bool
(SwitchTargets -> SwitchTargets -> Bool)
-> (SwitchTargets -> SwitchTargets -> Bool) -> Eq SwitchTargets
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: SwitchTargets -> SwitchTargets -> Bool
== :: SwitchTargets -> SwitchTargets -> Bool
$c/= :: SwitchTargets -> SwitchTargets -> Bool
/= :: SwitchTargets -> SwitchTargets -> Bool
Eq)
mkSwitchTargets :: Bool -> (Integer, Integer) -> Maybe Label -> M.Map Integer Label -> SwitchTargets
mkSwitchTargets :: Bool
-> (Integer, Integer)
-> Maybe Label
-> Map Integer Label
-> SwitchTargets
mkSwitchTargets Bool
signed range :: (Integer, Integer)
range@(Integer
lo,Integer
hi) Maybe Label
mbdef Map Integer Label
ids
    = Bool
-> (Integer, Integer)
-> Maybe Label
-> Map Integer Label
-> SwitchTargets
SwitchTargets Bool
signed (Integer, Integer)
range Maybe Label
mbdef' Map Integer Label
ids'
  where
    ids' :: Map Integer Label
ids' = Map Integer Label -> Map Integer Label
dropDefault (Map Integer Label -> Map Integer Label)
-> Map Integer Label -> Map Integer Label
forall a b. (a -> b) -> a -> b
$ Map Integer Label -> Map Integer Label
restrict Map Integer Label
ids
    mbdef' :: Maybe Label
mbdef' | Bool
defaultNeeded = Maybe Label
mbdef
           | Bool
otherwise     = Maybe Label
forall a. Maybe a
Nothing
    
    restrict :: Map Integer Label -> Map Integer Label
restrict = (Integer, Integer) -> Map Integer Label -> Map Integer Label
forall b. (Integer, Integer) -> Map Integer b -> Map Integer b
restrictMap (Integer
lo,Integer
hi)
    
    dropDefault :: Map Integer Label -> Map Integer Label
dropDefault | Just Label
l <- Maybe Label
mbdef = (Label -> Bool) -> Map Integer Label -> Map Integer Label
forall a k. (a -> Bool) -> Map k a -> Map k a
M.filter (Label -> Label -> Bool
forall a. Eq a => a -> a -> Bool
/= Label
l)
                | Bool
otherwise       = Map Integer Label -> Map Integer Label
forall a. a -> a
id
    
    defaultNeeded :: Bool
defaultNeeded = Int -> Integer
forall a b. (Integral a, Num b) => a -> b
fromIntegral (Map Integer Label -> Int
forall k a. Map k a -> Int
M.size Map Integer Label
ids') Integer -> Integer -> Bool
forall a. Eq a => a -> a -> Bool
/= Integer
hiInteger -> Integer -> Integer
forall a. Num a => a -> a -> a
-Integer
loInteger -> Integer -> Integer
forall a. Num a => a -> a -> a
+Integer
1
mapSwitchTargets :: (Label -> Label) -> SwitchTargets -> SwitchTargets
mapSwitchTargets :: (Label -> Label) -> SwitchTargets -> SwitchTargets
mapSwitchTargets Label -> Label
f (SwitchTargets Bool
signed (Integer, Integer)
range Maybe Label
mbdef Map Integer Label
branches)
    = Bool
-> (Integer, Integer)
-> Maybe Label
-> Map Integer Label
-> SwitchTargets
SwitchTargets Bool
signed (Integer, Integer)
range ((Label -> Label) -> Maybe Label -> Maybe Label
forall a b. (a -> b) -> Maybe a -> Maybe b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Label -> Label
f Maybe Label
mbdef) ((Label -> Label) -> Map Integer Label -> Map Integer Label
forall a b. (a -> b) -> Map Integer a -> Map Integer b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Label -> Label
f Map Integer Label
branches)
switchTargetsCases :: SwitchTargets -> [(Integer, Label)]
switchTargetsCases :: SwitchTargets -> [(Integer, Label)]
switchTargetsCases (SwitchTargets Bool
_ (Integer, Integer)
_ Maybe Label
_ Map Integer Label
branches) = Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
branches
switchTargetsDefault :: SwitchTargets -> Maybe Label
switchTargetsDefault :: SwitchTargets -> Maybe Label
switchTargetsDefault (SwitchTargets Bool
_ (Integer, Integer)
_ Maybe Label
mbdef Map Integer Label
_) = Maybe Label
mbdef
switchTargetsRange :: SwitchTargets -> (Integer, Integer)
switchTargetsRange :: SwitchTargets -> (Integer, Integer)
switchTargetsRange (SwitchTargets Bool
_ (Integer, Integer)
range Maybe Label
_ Map Integer Label
_) = (Integer, Integer)
range
switchTargetsSigned :: SwitchTargets -> Bool
switchTargetsSigned :: SwitchTargets -> Bool
switchTargetsSigned (SwitchTargets Bool
signed (Integer, Integer)
_ Maybe Label
_ Map Integer Label
_) = Bool
signed
switchTargetsToTable :: SwitchTargets -> (Int, [Maybe Label])
switchTargetsToTable :: SwitchTargets -> (Int, [Maybe Label])
switchTargetsToTable (SwitchTargets Bool
_ (Integer
lo,Integer
hi) Maybe Label
mbdef Map Integer Label
branches)
    = (Integer -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral (-Integer
start), [ Integer -> Maybe Label
labelFor Integer
i | Integer
i <- [Integer
start..Integer
hi] ])
  where
    labelFor :: Integer -> Maybe Label
labelFor Integer
i = case Integer -> Map Integer Label -> Maybe Label
forall k a. Ord k => k -> Map k a -> Maybe a
M.lookup Integer
i Map Integer Label
branches of Just Label
l -> Label -> Maybe Label
forall a. a -> Maybe a
Just Label
l
                                             Maybe Label
Nothing -> Maybe Label
mbdef
    start :: Integer
start | Integer
lo Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
>= Integer
0 Bool -> Bool -> Bool
&& Integer
lo Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
< Integer
minJumpTableOffset  = Integer
0  
          | Bool
otherwise                           = Integer
lo
switchTargetsToList :: SwitchTargets -> [Label]
switchTargetsToList :: SwitchTargets -> [Label]
switchTargetsToList (SwitchTargets Bool
_ (Integer, Integer)
_ Maybe Label
mbdef Map Integer Label
branches)
    = Maybe Label -> [Label]
forall a. Maybe a -> [a]
maybeToList Maybe Label
mbdef [Label] -> [Label] -> [Label]
forall a. [a] -> [a] -> [a]
++ Map Integer Label -> [Label]
forall k a. Map k a -> [a]
M.elems Map Integer Label
branches
switchTargetsFallThrough :: SwitchTargets -> ([([Integer], Label)], Maybe Label)
switchTargetsFallThrough :: SwitchTargets -> ([([Integer], Label)], Maybe Label)
switchTargetsFallThrough (SwitchTargets Bool
_ (Integer, Integer)
_ Maybe Label
mbdef Map Integer Label
branches) = ([([Integer], Label)]
groups, Maybe Label
mbdef)
  where
    groups :: [([Integer], Label)]
groups = ([(Integer, Label)] -> ([Integer], Label))
-> [[(Integer, Label)]] -> [([Integer], Label)]
forall a b. (a -> b) -> [a] -> [b]
map (\[(Integer, Label)]
xs -> (((Integer, Label) -> Integer) -> [(Integer, Label)] -> [Integer]
forall a b. (a -> b) -> [a] -> [b]
map (Integer, Label) -> Integer
forall a b. (a, b) -> a
fst [(Integer, Label)]
xs, (Integer, Label) -> Label
forall a b. (a, b) -> b
snd ([(Integer, Label)] -> (Integer, Label)
forall a. HasCallStack => [a] -> a
head [(Integer, Label)]
xs))) ([[(Integer, Label)]] -> [([Integer], Label)])
-> [[(Integer, Label)]] -> [([Integer], Label)]
forall a b. (a -> b) -> a -> b
$
             ((Integer, Label) -> (Integer, Label) -> Bool)
-> [(Integer, Label)] -> [[(Integer, Label)]]
forall a. (a -> a -> Bool) -> [a] -> [[a]]
groupBy (Label -> Label -> Bool
forall a. Eq a => a -> a -> Bool
(==) (Label -> Label -> Bool)
-> ((Integer, Label) -> Label)
-> (Integer, Label)
-> (Integer, Label)
-> Bool
forall b c a. (b -> b -> c) -> (a -> b) -> a -> a -> c
`on` (Integer, Label) -> Label
forall a b. (a, b) -> b
snd) ([(Integer, Label)] -> [[(Integer, Label)]])
-> [(Integer, Label)] -> [[(Integer, Label)]]
forall a b. (a -> b) -> a -> b
$
             Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
branches
eqSwitchTargetWith :: (Label -> Label -> Bool) -> SwitchTargets -> SwitchTargets -> Bool
eqSwitchTargetWith :: (Label -> Label -> Bool) -> SwitchTargets -> SwitchTargets -> Bool
eqSwitchTargetWith Label -> Label -> Bool
eq (SwitchTargets Bool
signed1 (Integer, Integer)
range1 Maybe Label
mbdef1 Map Integer Label
ids1) (SwitchTargets Bool
signed2 (Integer, Integer)
range2 Maybe Label
mbdef2 Map Integer Label
ids2) =
    Bool
signed1 Bool -> Bool -> Bool
forall a. Eq a => a -> a -> Bool
== Bool
signed2 Bool -> Bool -> Bool
&& (Integer, Integer)
range1 (Integer, Integer) -> (Integer, Integer) -> Bool
forall a. Eq a => a -> a -> Bool
== (Integer, Integer)
range2 Bool -> Bool -> Bool
&& Maybe Label -> Maybe Label -> Bool
goMB Maybe Label
mbdef1 Maybe Label
mbdef2 Bool -> Bool -> Bool
&& [(Integer, Label)] -> [(Integer, Label)] -> Bool
goList (Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
ids1) (Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
ids2)
  where
    goMB :: Maybe Label -> Maybe Label -> Bool
goMB Maybe Label
Nothing Maybe Label
Nothing = Bool
True
    goMB (Just Label
l1) (Just Label
l2) = Label
l1 Label -> Label -> Bool
`eq` Label
l2
    goMB Maybe Label
_ Maybe Label
_ = Bool
False
    goList :: [(Integer, Label)] -> [(Integer, Label)] -> Bool
goList [] [] = Bool
True
    goList ((Integer
i1,Label
l1):[(Integer, Label)]
ls1) ((Integer
i2,Label
l2):[(Integer, Label)]
ls2) = Integer
i1 Integer -> Integer -> Bool
forall a. Eq a => a -> a -> Bool
== Integer
i2 Bool -> Bool -> Bool
&& Label
l1 Label -> Label -> Bool
`eq` Label
l2 Bool -> Bool -> Bool
&& [(Integer, Label)] -> [(Integer, Label)] -> Bool
goList [(Integer, Label)]
ls1 [(Integer, Label)]
ls2
    goList [(Integer, Label)]
_ [(Integer, Label)]
_ = Bool
False
data SwitchPlan
    = Unconditionally Label
    | IfEqual Integer Label SwitchPlan
    | IfLT Bool Integer SwitchPlan SwitchPlan
    | JumpTable SwitchTargets
  deriving Int -> SwitchPlan -> ShowS
[SwitchPlan] -> ShowS
SwitchPlan -> String
(Int -> SwitchPlan -> ShowS)
-> (SwitchPlan -> String)
-> ([SwitchPlan] -> ShowS)
-> Show SwitchPlan
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> SwitchPlan -> ShowS
showsPrec :: Int -> SwitchPlan -> ShowS
$cshow :: SwitchPlan -> String
show :: SwitchPlan -> String
$cshowList :: [SwitchPlan] -> ShowS
showList :: [SwitchPlan] -> ShowS
Show
backendSupportsSwitch :: Backend -> Bool
backendSupportsSwitch :: Backend -> Bool
backendSupportsSwitch Backend
ViaC = Bool
True
backendSupportsSwitch Backend
LLVM = Bool
True
backendSupportsSwitch Backend
_    = Bool
False
createSwitchPlan :: SwitchTargets -> SwitchPlan
createSwitchPlan :: SwitchTargets -> SwitchPlan
createSwitchPlan (SwitchTargets Bool
_signed (Integer, Integer)
_range (Just Label
defLabel) Map Integer Label
m)
    | [(Integer
x, Label
l)] <- Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
m
    = Integer -> Label -> SwitchPlan -> SwitchPlan
IfEqual Integer
x Label
l (Label -> SwitchPlan
Unconditionally Label
defLabel)
createSwitchPlan (SwitchTargets Bool
_signed (Integer
lo,Integer
hi) Maybe Label
Nothing Map Integer Label
m)
    | [(Integer
x1, Label
l1), (Integer
_x2,Label
l2)] <- Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toAscList Map Integer Label
m
    
    , Integer
hi Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Integer
lo Integer -> Integer -> Bool
forall a. Eq a => a -> a -> Bool
== Integer
1
    = Integer -> Label -> SwitchPlan -> SwitchPlan
IfEqual Integer
x1 Label
l1 (Label -> SwitchPlan
Unconditionally Label
l2)
createSwitchPlan (SwitchTargets Bool
_signed (Integer, Integer)
_range (Just Label
defLabel) Map Integer Label
m)
    | [(Integer
x1, Label
l1), (Integer
x2,Label
l2)] <- Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toAscList Map Integer Label
m
    = Integer -> Label -> SwitchPlan -> SwitchPlan
IfEqual Integer
x1 Label
l1 (Integer -> Label -> SwitchPlan -> SwitchPlan
IfEqual Integer
x2 Label
l2 (Label -> SwitchPlan
Unconditionally Label
defLabel))
createSwitchPlan (SwitchTargets Bool
signed (Integer, Integer)
range Maybe Label
mbdef Map Integer Label
m) =
    
    SwitchPlan
plan
  where
    pieces :: [Map Integer Label]
pieces = (Map Integer Label -> [Map Integer Label])
-> [Map Integer Label] -> [Map Integer Label]
forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
concatMap Map Integer Label -> [Map Integer Label]
forall a. Map Integer a -> [Map Integer a]
breakTooSmall ([Map Integer Label] -> [Map Integer Label])
-> [Map Integer Label] -> [Map Integer Label]
forall a b. (a -> b) -> a -> b
$ Integer -> Map Integer Label -> [Map Integer Label]
forall a. Integer -> Map Integer a -> [Map Integer a]
splitAtHoles Integer
maxJumpTableHole Map Integer Label
m
    flatPlan :: FlatSwitchPlan
flatPlan = FlatSwitchPlan -> FlatSwitchPlan
findSingleValues (FlatSwitchPlan -> FlatSwitchPlan)
-> FlatSwitchPlan -> FlatSwitchPlan
forall a b. (a -> b) -> a -> b
$ Bool
-> Maybe Label
-> (Integer, Integer)
-> [Map Integer Label]
-> FlatSwitchPlan
mkFlatSwitchPlan Bool
signed Maybe Label
mbdef (Integer, Integer)
range [Map Integer Label]
pieces
    plan :: SwitchPlan
plan = Bool -> FlatSwitchPlan -> SwitchPlan
buildTree Bool
signed (FlatSwitchPlan -> SwitchPlan) -> FlatSwitchPlan -> SwitchPlan
forall a b. (a -> b) -> a -> b
$ FlatSwitchPlan
flatPlan
splitAtHoles :: Integer -> M.Map Integer a -> [M.Map Integer a]
splitAtHoles :: forall a. Integer -> Map Integer a -> [Map Integer a]
splitAtHoles Integer
_        Map Integer a
m | Map Integer a -> Bool
forall k a. Map k a -> Bool
M.null Map Integer a
m = []
splitAtHoles Integer
holeSize Map Integer a
m = ((Integer, Integer) -> Map Integer a)
-> [(Integer, Integer)] -> [Map Integer a]
forall a b. (a -> b) -> [a] -> [b]
map (\(Integer, Integer)
range -> (Integer, Integer) -> Map Integer a -> Map Integer a
forall b. (Integer, Integer) -> Map Integer b -> Map Integer b
restrictMap (Integer, Integer)
range Map Integer a
m) [(Integer, Integer)]
nonHoles
  where
    holes :: [(Integer, Integer)]
holes = ((Integer, Integer) -> Bool)
-> [(Integer, Integer)] -> [(Integer, Integer)]
forall a. (a -> Bool) -> [a] -> [a]
filter (\(Integer
l,Integer
h) -> Integer
h Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Integer
l Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
> Integer
holeSize) ([(Integer, Integer)] -> [(Integer, Integer)])
-> [(Integer, Integer)] -> [(Integer, Integer)]
forall a b. (a -> b) -> a -> b
$ [Integer] -> [Integer] -> [(Integer, Integer)]
forall a b. [a] -> [b] -> [(a, b)]
zip (Map Integer a -> [Integer]
forall k a. Map k a -> [k]
M.keys Map Integer a
m) ([Integer] -> [Integer]
forall a. HasCallStack => [a] -> [a]
tail (Map Integer a -> [Integer]
forall k a. Map k a -> [k]
M.keys Map Integer a
m))
    nonHoles :: [(Integer, Integer)]
nonHoles = Integer -> [(Integer, Integer)] -> Integer -> [(Integer, Integer)]
forall a. a -> [(a, a)] -> a -> [(a, a)]
reassocTuples Integer
lo [(Integer, Integer)]
holes Integer
hi
    (Integer
lo,a
_) = Map Integer a -> (Integer, a)
forall k a. Map k a -> (k, a)
M.findMin Map Integer a
m
    (Integer
hi,a
_) = Map Integer a -> (Integer, a)
forall k a. Map k a -> (k, a)
M.findMax Map Integer a
m
breakTooSmall :: M.Map Integer a -> [M.Map Integer a]
breakTooSmall :: forall a. Map Integer a -> [Map Integer a]
breakTooSmall Map Integer a
m
  | Map Integer a -> Int
forall k a. Map k a -> Int
M.size Map Integer a
m Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
minJumpTableSize = [Map Integer a
m]
  | Bool
otherwise                   = [Integer -> a -> Map Integer a
forall k a. k -> a -> Map k a
M.singleton Integer
k a
v | (Integer
k,a
v) <- Map Integer a -> [(Integer, a)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer a
m]
type FlatSwitchPlan = SeparatedList Integer SwitchPlan
mkFlatSwitchPlan :: Bool -> Maybe Label -> (Integer, Integer) -> [M.Map Integer Label] -> FlatSwitchPlan
mkFlatSwitchPlan :: Bool
-> Maybe Label
-> (Integer, Integer)
-> [Map Integer Label]
-> FlatSwitchPlan
mkFlatSwitchPlan Bool
_ Maybe Label
Nothing (Integer, Integer)
_ [] = String -> SDoc -> FlatSwitchPlan
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"mkFlatSwitchPlan with nothing left to do" SDoc
empty
mkFlatSwitchPlan Bool
signed  Maybe Label
Nothing (Integer, Integer)
_ (Map Integer Label
m:[Map Integer Label]
ms)
  = (Bool -> Maybe Label -> Map Integer Label -> SwitchPlan
mkLeafPlan Bool
signed Maybe Label
forall a. Maybe a
Nothing Map Integer Label
m , [ ((Integer, Label) -> Integer
forall a b. (a, b) -> a
fst (Map Integer Label -> (Integer, Label)
forall k a. Map k a -> (k, a)
M.findMin Map Integer Label
m'), Bool -> Maybe Label -> Map Integer Label -> SwitchPlan
mkLeafPlan Bool
signed Maybe Label
forall a. Maybe a
Nothing Map Integer Label
m') | Map Integer Label
m' <- [Map Integer Label]
ms ])
mkFlatSwitchPlan Bool
signed (Just Label
l) (Integer, Integer)
r [Map Integer Label]
ms = let ((Integer
_,SwitchPlan
p1):[(Integer, SwitchPlan)]
ps) = (Integer, Integer)
-> [Map Integer Label] -> [(Integer, SwitchPlan)]
go (Integer, Integer)
r [Map Integer Label]
ms in (SwitchPlan
p1, [(Integer, SwitchPlan)]
ps)
  where
    go :: (Integer, Integer)
-> [Map Integer Label] -> [(Integer, SwitchPlan)]
go (Integer
lo,Integer
hi) []
        | Integer
lo Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
> Integer
hi = []
        | Bool
otherwise = [(Integer
lo, Label -> SwitchPlan
Unconditionally Label
l)]
    go (Integer
lo,Integer
hi) (Map Integer Label
m:[Map Integer Label]
ms)
        | Integer
lo Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
< Integer
min
        = (Integer
lo, Label -> SwitchPlan
Unconditionally Label
l) (Integer, SwitchPlan)
-> [(Integer, SwitchPlan)] -> [(Integer, SwitchPlan)]
forall a. a -> [a] -> [a]
: (Integer, Integer)
-> [Map Integer Label] -> [(Integer, SwitchPlan)]
go (Integer
min,Integer
hi) (Map Integer Label
mMap Integer Label -> [Map Integer Label] -> [Map Integer Label]
forall a. a -> [a] -> [a]
:[Map Integer Label]
ms)
        | Integer
lo Integer -> Integer -> Bool
forall a. Eq a => a -> a -> Bool
== Integer
min
        = (Integer
lo, Bool -> Maybe Label -> Map Integer Label -> SwitchPlan
mkLeafPlan Bool
signed (Label -> Maybe Label
forall a. a -> Maybe a
Just Label
l) Map Integer Label
m) (Integer, SwitchPlan)
-> [(Integer, SwitchPlan)] -> [(Integer, SwitchPlan)]
forall a. a -> [a] -> [a]
: (Integer, Integer)
-> [Map Integer Label] -> [(Integer, SwitchPlan)]
go (Integer
maxInteger -> Integer -> Integer
forall a. Num a => a -> a -> a
+Integer
1,Integer
hi) [Map Integer Label]
ms
        | Bool
otherwise
        = String -> SDoc -> [(Integer, SwitchPlan)]
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"mkFlatSwitchPlan" (Integer -> SDoc
integer Integer
lo SDoc -> SDoc -> SDoc
<+> Integer -> SDoc
integer Integer
min)
      where
        min :: Integer
min = (Integer, Label) -> Integer
forall a b. (a, b) -> a
fst (Map Integer Label -> (Integer, Label)
forall k a. Map k a -> (k, a)
M.findMin Map Integer Label
m)
        max :: Integer
max = (Integer, Label) -> Integer
forall a b. (a, b) -> a
fst (Map Integer Label -> (Integer, Label)
forall k a. Map k a -> (k, a)
M.findMax Map Integer Label
m)
mkLeafPlan :: Bool -> Maybe Label -> M.Map Integer Label -> SwitchPlan
mkLeafPlan :: Bool -> Maybe Label -> Map Integer Label -> SwitchPlan
mkLeafPlan Bool
signed Maybe Label
mbdef Map Integer Label
m
    | [(Integer
_,Label
l)] <- Map Integer Label -> [(Integer, Label)]
forall k a. Map k a -> [(k, a)]
M.toList Map Integer Label
m 
    = Label -> SwitchPlan
Unconditionally Label
l
    | Bool
otherwise
    = SwitchTargets -> SwitchPlan
JumpTable (SwitchTargets -> SwitchPlan) -> SwitchTargets -> SwitchPlan
forall a b. (a -> b) -> a -> b
$ Bool
-> (Integer, Integer)
-> Maybe Label
-> Map Integer Label
-> SwitchTargets
mkSwitchTargets Bool
signed (Integer
min,Integer
max) Maybe Label
mbdef Map Integer Label
m
  where
    min :: Integer
min = (Integer, Label) -> Integer
forall a b. (a, b) -> a
fst (Map Integer Label -> (Integer, Label)
forall k a. Map k a -> (k, a)
M.findMin Map Integer Label
m)
    max :: Integer
max = (Integer, Label) -> Integer
forall a b. (a, b) -> a
fst (Map Integer Label -> (Integer, Label)
forall k a. Map k a -> (k, a)
M.findMax Map Integer Label
m)
findSingleValues :: FlatSwitchPlan -> FlatSwitchPlan
findSingleValues :: FlatSwitchPlan -> FlatSwitchPlan
findSingleValues (Unconditionally Label
l, (Integer
i, Unconditionally Label
l2) : (Integer
i', Unconditionally Label
l3) : [(Integer, SwitchPlan)]
xs)
  | Label
l Label -> Label -> Bool
forall a. Eq a => a -> a -> Bool
== Label
l3 Bool -> Bool -> Bool
&& Integer
i Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
+ Integer
1 Integer -> Integer -> Bool
forall a. Eq a => a -> a -> Bool
== Integer
i'
  = FlatSwitchPlan -> FlatSwitchPlan
findSingleValues (Integer -> Label -> SwitchPlan -> SwitchPlan
IfEqual Integer
i Label
l2 (Label -> SwitchPlan
Unconditionally Label
l), [(Integer, SwitchPlan)]
xs)
findSingleValues (SwitchPlan
p, (Integer
i,SwitchPlan
p'):[(Integer, SwitchPlan)]
xs)
  = (SwitchPlan
p,Integer
i) (SwitchPlan, Integer) -> FlatSwitchPlan -> FlatSwitchPlan
forall a b. (a, b) -> SeparatedList b a -> SeparatedList b a
`consSL` FlatSwitchPlan -> FlatSwitchPlan
findSingleValues (SwitchPlan
p', [(Integer, SwitchPlan)]
xs)
findSingleValues (SwitchPlan
p, [])
  = (SwitchPlan
p, [])
buildTree :: Bool -> FlatSwitchPlan -> SwitchPlan
buildTree :: Bool -> FlatSwitchPlan -> SwitchPlan
buildTree Bool
_ (SwitchPlan
p,[]) = SwitchPlan
p
buildTree Bool
signed FlatSwitchPlan
sl = Bool -> Integer -> SwitchPlan -> SwitchPlan -> SwitchPlan
IfLT Bool
signed Integer
m (Bool -> FlatSwitchPlan -> SwitchPlan
buildTree Bool
signed FlatSwitchPlan
sl1) (Bool -> FlatSwitchPlan -> SwitchPlan
buildTree Bool
signed FlatSwitchPlan
sl2)
  where
    (FlatSwitchPlan
sl1, Integer
m, FlatSwitchPlan
sl2) = FlatSwitchPlan -> (FlatSwitchPlan, Integer, FlatSwitchPlan)
forall b a.
SeparatedList b a -> (SeparatedList b a, b, SeparatedList b a)
divideSL FlatSwitchPlan
sl
type SeparatedList b a = (a, [(b,a)])
consSL :: (a, b) -> SeparatedList b a -> SeparatedList b a
consSL :: forall a b. (a, b) -> SeparatedList b a -> SeparatedList b a
consSL (a
a, b
b) (a
a', [(b, a)]
xs) = (a
a, (b
b,a
a')(b, a) -> [(b, a)] -> [(b, a)]
forall a. a -> [a] -> [a]
:[(b, a)]
xs)
divideSL :: SeparatedList b a -> (SeparatedList b a, b, SeparatedList b a)
divideSL :: forall b a.
SeparatedList b a -> (SeparatedList b a, b, SeparatedList b a)
divideSL (a
_,[]) = String -> ((a, [(b, a)]), b, (a, [(b, a)]))
forall a. HasCallStack => String -> a
error String
"divideSL: Singleton SeparatedList"
divideSL (a
p,[(b, a)]
xs) = ((a
p, [(b, a)]
xs1), b
m, (a
p', [(b, a)]
xs2))
  where
    ([(b, a)]
xs1, (b
m,a
p'):[(b, a)]
xs2) = Int -> [(b, a)] -> ([(b, a)], [(b, a)])
forall a. Int -> [a] -> ([a], [a])
splitAt ([(b, a)] -> Int
forall a. [a] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [(b, a)]
xs Int -> Int -> Int
forall a. Integral a => a -> a -> a
`div` Int
2) [(b, a)]
xs
restrictMap :: (Integer,Integer) -> M.Map Integer b -> M.Map Integer b
restrictMap :: forall b. (Integer, Integer) -> Map Integer b -> Map Integer b
restrictMap (Integer
lo,Integer
hi) Map Integer b
m = Map Integer b
mid
  where (Map Integer b
_,   Map Integer b
mid_hi) = Integer -> Map Integer b -> (Map Integer b, Map Integer b)
forall k a. Ord k => k -> Map k a -> (Map k a, Map k a)
M.split (Integer
loInteger -> Integer -> Integer
forall a. Num a => a -> a -> a
-Integer
1) Map Integer b
m
        (Map Integer b
mid, Map Integer b
_) =      Integer -> Map Integer b -> (Map Integer b, Map Integer b)
forall k a. Ord k => k -> Map k a -> (Map k a, Map k a)
M.split (Integer
hiInteger -> Integer -> Integer
forall a. Num a => a -> a -> a
+Integer
1) Map Integer b
mid_hi
reassocTuples :: a -> [(a,a)] -> a -> [(a,a)]
reassocTuples :: forall a. a -> [(a, a)] -> a -> [(a, a)]
reassocTuples a
initial [] a
last
    = [(a
initial,a
last)]
reassocTuples a
initial ((a
a,a
b):[(a, a)]
tuples) a
last
    = (a
initial,a
a) (a, a) -> [(a, a)] -> [(a, a)]
forall a. a -> [a] -> [a]
: a -> [(a, a)] -> a -> [(a, a)]
forall a. a -> [(a, a)] -> a -> [(a, a)]
reassocTuples a
b [(a, a)]
tuples a
last