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{- BlockId module should probably go away completely, being superseded by Label -}
module BlockId
( BlockId, mkBlockId -- ToDo: BlockId should be abstract, but it isn't yet
, BlockSet, BlockEnv
, IsSet(..), setInsertList, setDeleteList, setUnions
, IsMap(..), mapInsertList, mapDeleteList, mapUnions
, emptyBlockSet, emptyBlockMap
, blockLbl, infoTblLbl, retPtLbl
) where
import CLabel
import IdInfo
import Name
import Outputable
import Unique
import Compiler.Hoopl as Hoopl hiding (Unique)
import Compiler.Hoopl.GHC (uniqueToInt, uniqueToLbl, lblToUnique)
----------------------------------------------------------------
--- Block Ids, their environments, and their sets
{- Note [Unique BlockId]
~~~~~~~~~~~~~~~~~~~~~~~~
Although a 'BlockId' is a local label, for reasons of implementation,
'BlockId's must be unique within an entire compilation unit. The reason
is that each local label is mapped to an assembly-language label, and in
most assembly languages allow, a label is visible throughout the entire
compilation unit in which it appears.
-}
type BlockId = Hoopl.Label
instance Uniquable BlockId where
getUnique label = getUnique (uniqueToInt $ lblToUnique label)
mkBlockId :: Unique -> BlockId
mkBlockId unique = uniqueToLbl $ intToUnique $ getKey unique
instance Outputable BlockId where
ppr label = ppr (getUnique label)
retPtLbl :: BlockId -> CLabel
retPtLbl label = mkReturnPtLabel $ getUnique label
blockLbl :: BlockId -> CLabel
blockLbl label = mkEntryLabel (mkFCallName (getUnique label) "block") NoCafRefs
infoTblLbl :: BlockId -> CLabel
infoTblLbl label = mkInfoTableLabel (mkFCallName (getUnique label) "block") NoCafRefs
-- Block environments: Id blocks
type BlockEnv a = Hoopl.LabelMap a
instance Outputable a => Outputable (BlockEnv a) where
ppr = ppr . mapToList
emptyBlockMap :: BlockEnv a
emptyBlockMap = mapEmpty
-- Block sets
type BlockSet = Hoopl.LabelSet
instance Outputable BlockSet where
ppr = ppr . setElems
emptyBlockSet :: BlockSet
emptyBlockSet = setEmpty
|
