2 % (c) The University of Glasgow, 2000-2006
5 -- ---------------------------------------------------------------------------
6 -- The dynamic linker for object code (.o .so .dll files)
7 -- ---------------------------------------------------------------------------
9 Primarily, this module consists of an interface to the C-land dynamic linker.
12 {-# OPTIONS -#include "Linker.h" #-}
15 initObjLinker, -- :: IO ()
16 loadDLL, -- :: String -> IO (Maybe String)
17 loadObj, -- :: String -> IO ()
18 unloadObj, -- :: String -> IO ()
19 insertSymbol, -- :: String -> String -> Ptr a -> IO ()
20 lookupSymbol, -- :: String -> IO (Maybe (Ptr a))
21 resolveObjs -- :: IO SuccessFlag
25 import BasicTypes ( SuccessFlag, successIf )
26 import Config ( cLeadingUnderscore )
28 import Control.Monad ( when )
30 import Foreign ( nullPtr )
31 import GHC.Exts ( Ptr(..), unsafeCoerce# )
35 -- ---------------------------------------------------------------------------
36 -- RTS Linker Interface
37 -- ---------------------------------------------------------------------------
39 insertSymbol :: String -> String -> Ptr a -> IO ()
40 insertSymbol obj_name key symbol
41 = let str = prefixUnderscore key
42 in withCString obj_name $ \c_obj_name ->
43 withCString str $ \c_str ->
44 c_insertSymbol c_obj_name c_str symbol
46 lookupSymbol :: String -> IO (Maybe (Ptr a))
47 lookupSymbol str_in = do
48 let str = prefixUnderscore str_in
49 withCString str $ \c_str -> do
50 addr <- c_lookupSymbol c_str
53 else return (Just addr)
55 prefixUnderscore :: String -> String
57 | cLeadingUnderscore == "YES" = ('_':)
60 loadDLL :: String -> IO (Maybe String)
62 -- Just err_msg => failure
64 maybe_errmsg <- withCString str $ \dll -> c_addDLL dll
65 if maybe_errmsg == nullPtr
67 else do str <- peekCString maybe_errmsg
70 loadObj :: String -> IO ()
72 withCString str $ \c_str -> do
74 when (r == 0) (panic "loadObj: failed")
76 unloadObj :: String -> IO ()
78 withCString str $ \c_str -> do
79 r <- c_unloadObj c_str
80 when (r == 0) (panic "unloadObj: failed")
82 resolveObjs :: IO SuccessFlag
85 return (successIf (r /= 0))
87 -- ---------------------------------------------------------------------------
88 -- Foreign declarations to RTS entry points which does the real work;
89 -- ---------------------------------------------------------------------------
91 foreign import ccall unsafe "addDLL" c_addDLL :: CString -> IO CString
92 foreign import ccall unsafe "initLinker" initObjLinker :: IO ()
93 foreign import ccall unsafe "insertSymbol" c_insertSymbol :: CString -> CString -> Ptr a -> IO ()
94 foreign import ccall unsafe "lookupSymbol" c_lookupSymbol :: CString -> IO (Ptr a)
95 foreign import ccall unsafe "loadObj" c_loadObj :: CString -> IO Int
96 foreign import ccall unsafe "unloadObj" c_unloadObj :: CString -> IO Int
97 foreign import ccall unsafe "resolveObjs" c_resolveObjs :: IO Int