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|
-- | Foreign export stubs
{-# LANGUAGE DerivingVia #-}
module GHC.Types.ForeignStubs
( ForeignStubs (..)
, CHeader(..)
, CStub(..)
, appendStubC
)
where
import GHC.Utils.Outputable
import Data.Monoid
import Data.Semigroup
import Data.Coerce
newtype CStub = CStub { getCStub :: SDoc }
emptyCStub :: CStub
emptyCStub = CStub empty
instance Monoid CStub where
mempty = emptyCStub
mconcat = coerce vcat
instance Semigroup CStub where
(<>) = coerce ($$)
newtype CHeader = CHeader { getCHeader :: SDoc }
deriving (Monoid, Semigroup) via CStub
-- | Foreign export stubs
data ForeignStubs
= NoStubs
-- ^ We don't have any stubs
| ForeignStubs CHeader CStub
-- ^ There are some stubs. Parameters:
--
-- 1) Header file prototypes for
-- "foreign exported" functions
--
-- 2) C stubs to use when calling
-- "foreign exported" functions
appendStubC :: ForeignStubs -> CStub -> ForeignStubs
appendStubC NoStubs c_code = ForeignStubs mempty c_code
appendStubC (ForeignStubs h c) c_code = ForeignStubs h (c `mappend` c_code)
|
