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{-# LANGUAGE TypeSynonymInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{- BlockId module should probably go away completely, being superseded by Label -}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
, newBlockId
, blockLbl, infoTblLbl
) where
import GhcPrelude
import CLabel
import IdInfo
import Name
import Unique
import UniqSupply
import Hoopl.Label (Label, uniqueToLbl)
import Hoopl.Unique (intToUnique)
----------------------------------------------------------------
--- 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 = Label
mkBlockId :: Unique -> BlockId
mkBlockId unique = uniqueToLbl $ intToUnique $ getKey unique
newBlockId :: MonadUnique m => m BlockId
newBlockId = mkBlockId <$> getUniqueM
blockLbl :: BlockId -> CLabel
blockLbl label = mkAsmTempLabel (getUnique label)
infoTblLbl :: BlockId -> CLabel
infoTblLbl label = mkInfoTableLabel (mkFCallName (getUnique label) "block") NoCafRefs
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