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-- | This stuff here is related to supporting the Safe Haskell extension,
-- primarily about storing under what trust type a module has been compiled.
module GHC.Types.SafeHaskell
( IsSafeImport
, SafeHaskellMode(..)
, IfaceTrustInfo
, getSafeMode
, setSafeMode
, noIfaceTrustInfo
)
where
import GHC.Prelude
import GHC.Utils.Binary
import GHC.Utils.Outputable
import Data.Word
-- | Is an import a safe import?
type IsSafeImport = Bool
-- | The various Safe Haskell modes
data SafeHaskellMode
= Sf_None -- ^ inferred unsafe
| Sf_Unsafe -- ^ declared and checked
| Sf_Trustworthy -- ^ declared and checked
| Sf_Safe -- ^ declared and checked
| Sf_SafeInferred -- ^ inferred as safe
| Sf_Ignore -- ^ @-fno-safe-haskell@ state
deriving (Eq)
instance Show SafeHaskellMode where
show Sf_None = "None"
show Sf_Unsafe = "Unsafe"
show Sf_Trustworthy = "Trustworthy"
show Sf_Safe = "Safe"
show Sf_SafeInferred = "Safe-Inferred"
show Sf_Ignore = "Ignore"
instance Outputable SafeHaskellMode where
ppr = text . show
-- | Safe Haskell information for 'ModIface'
-- Simply a wrapper around SafeHaskellMode to separate iface and flags
newtype IfaceTrustInfo = TrustInfo SafeHaskellMode
getSafeMode :: IfaceTrustInfo -> SafeHaskellMode
getSafeMode (TrustInfo x) = x
setSafeMode :: SafeHaskellMode -> IfaceTrustInfo
setSafeMode = TrustInfo
noIfaceTrustInfo :: IfaceTrustInfo
noIfaceTrustInfo = setSafeMode Sf_None
trustInfoToNum :: IfaceTrustInfo -> Word8
trustInfoToNum it
= case getSafeMode it of
Sf_None -> 0
Sf_Unsafe -> 1
Sf_Trustworthy -> 2
Sf_Safe -> 3
Sf_SafeInferred -> 4
Sf_Ignore -> 0
numToTrustInfo :: Word8 -> IfaceTrustInfo
numToTrustInfo 0 = setSafeMode Sf_None
numToTrustInfo 1 = setSafeMode Sf_Unsafe
numToTrustInfo 2 = setSafeMode Sf_Trustworthy
numToTrustInfo 3 = setSafeMode Sf_Safe
numToTrustInfo 4 = setSafeMode Sf_SafeInferred
numToTrustInfo n = error $ "numToTrustInfo: bad input number! (" ++ show n ++ ")"
instance Outputable IfaceTrustInfo where
ppr (TrustInfo Sf_None) = text "none"
ppr (TrustInfo Sf_Ignore) = text "none"
ppr (TrustInfo Sf_Unsafe) = text "unsafe"
ppr (TrustInfo Sf_Trustworthy) = text "trustworthy"
ppr (TrustInfo Sf_Safe) = text "safe"
ppr (TrustInfo Sf_SafeInferred) = text "safe-inferred"
instance Binary IfaceTrustInfo where
put_ bh iftrust = putByte bh $ trustInfoToNum iftrust
get bh = getByte bh >>= (return . numToTrustInfo)
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