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Jul 11, 2025
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Mangoiv/improve key business #4654

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10 changes: 9 additions & 1 deletion hls-graph/src/Development/IDE/Graph/Internal/Key.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ module Development.IDE.Graph.Internal.Key
) where

--import Control.Monad.IO.Class ()
import Control.Exception (evaluate)
import Data.Coerce
import Data.Dynamic
import qualified Data.HashMap.Strict as Map
Expand Down Expand Up @@ -85,8 +86,15 @@ newKey k = unsafePerformIO $ do

lookupKeyValue :: Key -> KeyValue
lookupKeyValue (UnsafeMkKey x) = unsafePerformIO $ do
-- NOTE:
-- The reason for this evaluate is that the x, if not forced yet, is a thunk
-- that forces the atomicModifyIORef' in the creation of the new key. If it
-- isn't forced *before* reading the keyMap, the keyMap will only obtain the new
-- key (x) *after* the IntMap is already copied out of the keyMap reference,
-- i.e. when it is forced for the lookup in the IntMap.
k <- evaluate x
GlobalKeyValueMap _ im _ <- readIORef keyMap
pure $! im IM.! x
pure $! im IM.! k

{-# NOINLINE lookupKeyValue #-}

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