{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE QuasiQuotes #-}
module Language.C.Inline.Cpp.Exceptions
( CppException(..)
, toSomeException
, throwBlock
, tryBlock
, catchBlock
) where
import Control.Exception.Safe
import qualified Language.C.Inline as C
import qualified Language.C.Inline.Internal as C
import qualified Language.C.Inline.Cpp as Cpp
import Language.Haskell.TH
import Language.Haskell.TH.Quote
import Foreign
import Foreign.C
C.context Cpp.cppCtx
C.include "HaskellException.hxx"
data CppException
= CppStdException String
| CppOtherException (Maybe String)
| CppHaskellException SomeException
deriving (Int -> CppException -> ShowS
[CppException] -> ShowS
CppException -> String
(Int -> CppException -> ShowS)
-> (CppException -> String)
-> ([CppException] -> ShowS)
-> Show CppException
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [CppException] -> ShowS
$cshowList :: [CppException] -> ShowS
show :: CppException -> String
$cshow :: CppException -> String
showsPrec :: Int -> CppException -> ShowS
$cshowsPrec :: Int -> CppException -> ShowS
Show)
toSomeException :: CppException -> SomeException
toSomeException :: CppException -> SomeException
toSomeException (CppHaskellException SomeException
e) = SomeException
e
toSomeException CppException
x = CppException -> SomeException
forall e. Exception e => e -> SomeException
toException CppException
x
instance Exception CppException
pattern ExTypeNoException :: CInt
pattern $bExTypeNoException :: CInt
$mExTypeNoException :: forall r. CInt -> (Void# -> r) -> (Void# -> r) -> r
ExTypeNoException = 0
pattern ExTypeStdException :: CInt
pattern $bExTypeStdException :: CInt
$mExTypeStdException :: forall r. CInt -> (Void# -> r) -> (Void# -> r) -> r
ExTypeStdException = 1
pattern ExTypeHaskellException :: CInt
pattern $bExTypeHaskellException :: CInt
$mExTypeHaskellException :: forall r. CInt -> (Void# -> r) -> (Void# -> r) -> r
ExTypeHaskellException = 2
pattern ExTypeOtherException :: CInt
pattern $bExTypeOtherException :: CInt
$mExTypeOtherException :: forall r. CInt -> (Void# -> r) -> (Void# -> r) -> r
ExTypeOtherException = 3
handleForeignCatch :: (Ptr CInt -> Ptr CString -> Ptr (Ptr ()) -> IO a) -> IO (Either CppException a)
handleForeignCatch :: (Ptr CInt -> Ptr CString -> Ptr (Ptr ()) -> IO a)
-> IO (Either CppException a)
handleForeignCatch Ptr CInt -> Ptr CString -> Ptr (Ptr ()) -> IO a
cont =
(Ptr CInt -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. Storable a => (Ptr a -> IO b) -> IO b
alloca ((Ptr CInt -> IO (Either CppException a))
-> IO (Either CppException a))
-> (Ptr CInt -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. (a -> b) -> a -> b
$ \Ptr CInt
exTypePtr ->
(Ptr CString -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. Storable a => (Ptr a -> IO b) -> IO b
alloca ((Ptr CString -> IO (Either CppException a))
-> IO (Either CppException a))
-> (Ptr CString -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. (a -> b) -> a -> b
$ \Ptr CString
msgPtrPtr ->
(Ptr (Ptr ()) -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. Storable a => (Ptr a -> IO b) -> IO b
alloca ((Ptr (Ptr ()) -> IO (Either CppException a))
-> IO (Either CppException a))
-> (Ptr (Ptr ()) -> IO (Either CppException a))
-> IO (Either CppException a)
forall a b. (a -> b) -> a -> b
$ \Ptr (Ptr ())
haskellExPtrPtr -> do
Ptr CInt -> CInt -> IO ()
forall a. Storable a => Ptr a -> a -> IO ()
poke Ptr CInt
exTypePtr CInt
ExTypeNoException
IO (Either CppException a) -> IO (Either CppException a)
forall (m :: * -> *) a. MonadMask m => m a -> m a
mask_ (IO (Either CppException a) -> IO (Either CppException a))
-> IO (Either CppException a) -> IO (Either CppException a)
forall a b. (a -> b) -> a -> b
$ do
a
res <- Ptr CInt -> Ptr CString -> Ptr (Ptr ()) -> IO a
cont Ptr CInt
exTypePtr Ptr CString
msgPtrPtr Ptr (Ptr ())
haskellExPtrPtr
CInt
exType <- Ptr CInt -> IO CInt
forall a. Storable a => Ptr a -> IO a
peek Ptr CInt
exTypePtr
case CInt
exType of
CInt
ExTypeNoException -> Either CppException a -> IO (Either CppException a)
forall (m :: * -> *) a. Monad m => a -> m a
return (a -> Either CppException a
forall a b. b -> Either a b
Right a
res)
CInt
ExTypeStdException -> do
CString
msgPtr <- Ptr CString -> IO CString
forall a. Storable a => Ptr a -> IO a
peek Ptr CString
msgPtrPtr
String
errMsg <- CString -> IO String
peekCString CString
msgPtr
CString -> IO ()
forall a. Ptr a -> IO ()
free CString
msgPtr
Either CppException a -> IO (Either CppException a)
forall (m :: * -> *) a. Monad m => a -> m a
return (CppException -> Either CppException a
forall a b. a -> Either a b
Left (String -> CppException
CppStdException String
errMsg))
CInt
ExTypeHaskellException -> do
Ptr ()
haskellExPtr <- Ptr (Ptr ()) -> IO (Ptr ())
forall a. Storable a => Ptr a -> IO a
peek Ptr (Ptr ())
haskellExPtrPtr
Ptr ()
stablePtr <- [C.block| void * {
return (static_cast<HaskellException *>($(void *haskellExPtr)))->haskellExceptionStablePtr->stablePtr;
} |]
SomeException
someExc <- StablePtr SomeException -> IO SomeException
forall a. StablePtr a -> IO a
deRefStablePtr (Ptr () -> StablePtr SomeException
forall a. Ptr () -> StablePtr a
castPtrToStablePtr Ptr ()
stablePtr)
[C.block| void{
delete static_cast<HaskellException *>($(void *haskellExPtr));
} |]
Either CppException a -> IO (Either CppException a)
forall (m :: * -> *) a. Monad m => a -> m a
return (CppException -> Either CppException a
forall a b. a -> Either a b
Left (SomeException -> CppException
CppHaskellException SomeException
someExc))
CInt
ExTypeOtherException -> do
CString
msgPtr <- Ptr CString -> IO CString
forall a. Storable a => Ptr a -> IO a
peek Ptr CString
msgPtrPtr
Maybe String
mbExcType <- if CString
msgPtr CString -> CString -> Bool
forall a. Eq a => a -> a -> Bool
== CString
forall a. Ptr a
nullPtr
then Maybe String -> IO (Maybe String)
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe String
forall a. Maybe a
Nothing
else do
String
excType <- CString -> IO String
peekCString CString
msgPtr
CString -> IO ()
forall a. Ptr a -> IO ()
free CString
msgPtr
Maybe String -> IO (Maybe String)
forall (m :: * -> *) a. Monad m => a -> m a
return (String -> Maybe String
forall a. a -> Maybe a
Just String
excType)
Either CppException a -> IO (Either CppException a)
forall (m :: * -> *) a. Monad m => a -> m a
return (CppException -> Either CppException a
forall a b. a -> Either a b
Left (Maybe String -> CppException
CppOtherException Maybe String
mbExcType))
CInt
_ -> String -> IO (Either CppException a)
forall a. HasCallStack => String -> a
error String
"Unexpected C++ exception type."
throwBlock :: QuasiQuoter
throwBlock :: QuasiQuoter
throwBlock = QuasiQuoter :: (String -> Q Exp)
-> (String -> Q Pat)
-> (String -> Q Type)
-> (String -> Q [Dec])
-> QuasiQuoter
QuasiQuoter
{ quoteExp :: String -> Q Exp
quoteExp = \String
blockStr -> do
[e| either (throwIO . toSomeException) return =<< $(tryBlockQuoteExp blockStr) |]
, quotePat :: String -> Q Pat
quotePat = String -> Q Pat
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteType :: String -> Q Type
quoteType = String -> Q Type
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteDec :: String -> Q [Dec]
quoteDec = String -> Q [Dec]
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
} where
unsupported :: p -> m a
unsupported p
_ = String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Unsupported quasiquotation."
catchBlock :: QuasiQuoter
catchBlock :: QuasiQuoter
catchBlock = QuasiQuoter :: (String -> Q Exp)
-> (String -> Q Pat)
-> (String -> Q Type)
-> (String -> Q [Dec])
-> QuasiQuoter
QuasiQuoter
{ quoteExp :: String -> Q Exp
quoteExp = \String
blockStr -> QuasiQuoter -> String -> Q Exp
quoteExp QuasiQuoter
throwBlock (String
"void {" String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
blockStr String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
"}")
, quotePat :: String -> Q Pat
quotePat = String -> Q Pat
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteType :: String -> Q Type
quoteType = String -> Q Type
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteDec :: String -> Q [Dec]
quoteDec = String -> Q [Dec]
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
} where
unsupported :: p -> m a
unsupported p
_ = String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Unsupported quasiquotation."
exceptionalValue :: String -> String
exceptionalValue :: ShowS
exceptionalValue String
typeStr =
case String
typeStr of
String
"void" -> String
""
String
"char" -> String
"0"
String
"short" -> String
"0"
String
"long" -> String
"0"
String
"int" -> String
"0"
String
"int8_t" -> String
"0"
String
"int16_t" -> String
"0"
String
"int32_t" -> String
"0"
String
"int64_t" -> String
"0"
String
"uint8_t" -> String
"0"
String
"uint16_t" -> String
"0"
String
"uint32_t" -> String
"0"
String
"uint64_t" -> String
"0"
String
"float" -> String
"0"
String
"double" -> String
"0"
String
"bool" -> String
"0"
String
"signed char" -> String
"0"
String
"signed short" -> String
"0"
String
"signed int" -> String
"0"
String
"signed long" -> String
"0"
String
"unsigned char" -> String
"0"
String
"unsigned short" -> String
"0"
String
"unsigned int" -> String
"0"
String
"unsigned long" -> String
"0"
String
"size_t" -> String
"0"
String
"wchar_t" -> String
"0"
String
"ptrdiff_t" -> String
"0"
String
"sig_atomic_t" -> String
"0"
String
"intptr_t" -> String
"0"
String
"uintptr_t" -> String
"0"
String
"intmax_t" -> String
"0"
String
"uintmax_t" -> String
"0"
String
"clock_t" -> String
"0"
String
"time_t" -> String
"0"
String
"useconds_t" -> String
"0"
String
"suseconds_t" -> String
"0"
String
"FILE" -> String
"0"
String
"fpos_t" -> String
"0"
String
"jmp_buf" -> String
"0"
String
_ -> String
"{}"
tryBlockQuoteExp :: String -> Q Exp
tryBlockQuoteExp :: String -> Q Exp
tryBlockQuoteExp String
blockStr = do
let (String
ty, String
body) = String -> (String, String)
C.splitTypedC String
blockStr
[Dec]
_ <- String -> Q [Dec]
C.include String
"HaskellException.hxx"
Name
typePtrVarName <- String -> Q Name
newName String
"exTypePtr"
Name
msgPtrVarName <- String -> Q Name
newName String
"msgPtr"
Name
haskellExPtrVarName <- String -> Q Name
newName String
"haskellExPtr"
let inlineCStr :: String
inlineCStr = [String] -> String
unlines
[ String
ty String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
" {"
, String
" int* __inline_c_cpp_exception_type__ = $(int* " String -> ShowS
forall a. [a] -> [a] -> [a]
++ Name -> String
nameBase Name
typePtrVarName String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
");"
, String
" char** __inline_c_cpp_error_message__ = $(char** " String -> ShowS
forall a. [a] -> [a] -> [a]
++ Name -> String
nameBase Name
msgPtrVarName String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
");"
, String
" HaskellException** __inline_c_cpp_haskellexception__ = (HaskellException**)($(void ** " String -> ShowS
forall a. [a] -> [a] -> [a]
++ Name -> String
nameBase Name
haskellExPtrVarName String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
"));"
, String
" try {"
, String
body
, String
" } catch (HaskellException &e) {"
, String
" *__inline_c_cpp_exception_type__ = " String -> ShowS
forall a. [a] -> [a] -> [a]
++ CInt -> String
forall a. Show a => a -> String
show CInt
ExTypeHaskellException String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" *__inline_c_cpp_haskellexception__ = new HaskellException(e);"
, String
" return " String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
exceptionalValue String
ty String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" } catch (std::exception &e) {"
, String
" *__inline_c_cpp_exception_type__ = " String -> ShowS
forall a. [a] -> [a] -> [a]
++ CInt -> String
forall a. Show a => a -> String
show CInt
ExTypeStdException String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" setMessageOfStdException(e,__inline_c_cpp_error_message__);"
, String
" return " String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
exceptionalValue String
ty String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" } catch (...) {"
, String
" *__inline_c_cpp_exception_type__ = " String -> ShowS
forall a. [a] -> [a] -> [a]
++ CInt -> String
forall a. Show a => a -> String
show CInt
ExTypeOtherException String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" setMessageOfOtherException(__inline_c_cpp_error_message__);"
, String
" return " String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
exceptionalValue String
ty String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
";"
, String
" }"
, String
"}"
]
[e| handleForeignCatch $ \ $(varP typePtrVarName) $(varP msgPtrVarName) $(varP haskellExPtrVarName) -> $(quoteExp C.block inlineCStr) |]
tryBlock :: QuasiQuoter
tryBlock :: QuasiQuoter
tryBlock = QuasiQuoter :: (String -> Q Exp)
-> (String -> Q Pat)
-> (String -> Q Type)
-> (String -> Q [Dec])
-> QuasiQuoter
QuasiQuoter
{ quoteExp :: String -> Q Exp
quoteExp = String -> Q Exp
tryBlockQuoteExp
, quotePat :: String -> Q Pat
quotePat = String -> Q Pat
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteType :: String -> Q Type
quoteType = String -> Q Type
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
, quoteDec :: String -> Q [Dec]
quoteDec = String -> Q [Dec]
forall (m :: * -> *) p a. MonadFail m => p -> m a
unsupported
} where
unsupported :: p -> m a
unsupported p
_ = String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Unsupported quasiquotation."