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|
%
% (c) The University of Glasgow, 2000-2006
%
-- ---------------------------------------------------------------------------
-- The dynamic linker for object code (.o .so .dll files)
-- ---------------------------------------------------------------------------
Primarily, this module consists of an interface to the C-land dynamic linker.
\begin{code}
{-# OPTIONS -#include "Linker.h" #-}
module ObjLink (
initObjLinker, -- :: IO ()
loadDLL, -- :: String -> IO (Maybe String)
loadObj, -- :: String -> IO ()
unloadObj, -- :: String -> IO ()
insertSymbol, -- :: String -> String -> Ptr a -> IO ()
lookupSymbol, -- :: String -> IO (Maybe (Ptr a))
resolveObjs -- :: IO SuccessFlag
) where
import Panic ( panic )
import BasicTypes ( SuccessFlag, successIf )
import Config ( cLeadingUnderscore )
import Outputable
import Control.Monad ( when )
import Foreign.C
import Foreign ( nullPtr )
import GHC.Exts ( Ptr(..), unsafeCoerce# )
-- ---------------------------------------------------------------------------
-- RTS Linker Interface
-- ---------------------------------------------------------------------------
insertSymbol :: String -> String -> Ptr a -> IO ()
insertSymbol obj_name key symbol
= let str = prefixUnderscore key
in withCString obj_name $ \c_obj_name ->
withCString str $ \c_str ->
c_insertSymbol c_obj_name c_str symbol
lookupSymbol :: String -> IO (Maybe (Ptr a))
lookupSymbol str_in = do
let str = prefixUnderscore str_in
withCString str $ \c_str -> do
addr <- c_lookupSymbol c_str
if addr == nullPtr
then return Nothing
else return (Just addr)
prefixUnderscore :: String -> String
prefixUnderscore
| cLeadingUnderscore == "YES" = ('_':)
| otherwise = id
loadDLL :: String -> IO (Maybe String)
-- Nothing => success
-- Just err_msg => failure
loadDLL str = do
maybe_errmsg <- withCString str $ \dll -> c_addDLL dll
if maybe_errmsg == nullPtr
then return Nothing
else do str <- peekCString maybe_errmsg
return (Just str)
loadObj :: String -> IO ()
loadObj str = do
withCString str $ \c_str -> do
r <- c_loadObj c_str
when (r == 0) (panic "loadObj: failed")
unloadObj :: String -> IO ()
unloadObj str =
withCString str $ \c_str -> do
r <- c_unloadObj c_str
when (r == 0) (panic "unloadObj: failed")
resolveObjs :: IO SuccessFlag
resolveObjs = do
r <- c_resolveObjs
return (successIf (r /= 0))
-- ---------------------------------------------------------------------------
-- Foreign declarations to RTS entry points which does the real work;
-- ---------------------------------------------------------------------------
foreign import ccall unsafe "addDLL" c_addDLL :: CString -> IO CString
foreign import ccall unsafe "initLinker" initObjLinker :: IO ()
foreign import ccall unsafe "insertSymbol" c_insertSymbol :: CString -> CString -> Ptr a -> IO ()
foreign import ccall unsafe "lookupSymbol" c_lookupSymbol :: CString -> IO (Ptr a)
foreign import ccall unsafe "loadObj" c_loadObj :: CString -> IO Int
foreign import ccall unsafe "unloadObj" c_unloadObj :: CString -> IO Int
foreign import ccall unsafe "resolveObjs" c_resolveObjs :: IO Int
\end{code}
|
