2 % (c) The University of Glasgow, 2000
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 lookupSymbol, -- :: String -> IO (Maybe (Ptr a))
20 resolveObjs -- :: IO SuccessFlag
26 import Foreign ( Ptr, nullPtr )
27 import Panic ( panic )
28 import BasicTypes ( SuccessFlag, successIf )
31 -- ---------------------------------------------------------------------------
32 -- RTS Linker Interface
33 -- ---------------------------------------------------------------------------
35 lookupSymbol :: String -> IO (Maybe (Ptr a))
36 lookupSymbol str_in = do
37 let str = prefixUnderscore str_in
38 withCString str $ \c_str -> do
39 addr <- c_lookupSymbol c_str
42 else return (Just addr)
44 prefixUnderscore :: String -> String
46 | cLeadingUnderscore == "YES" = ('_':)
49 loadDLL :: String -> IO (Maybe String)
51 -- Just err_msg => failure
53 maybe_errmsg <- withCString str $ \dll -> c_addDLL dll
54 if maybe_errmsg == nullPtr
56 else do str <- peekCString maybe_errmsg
59 loadObj :: String -> IO ()
61 withCString str $ \c_str -> do
63 when (r == 0) (panic "loadObj: failed")
65 unloadObj :: String -> IO ()
67 withCString str $ \c_str -> do
68 r <- c_unloadObj c_str
69 when (r == 0) (panic "unloadObj: failed")
71 resolveObjs :: IO SuccessFlag
74 return (successIf (r /= 0))
76 -- ---------------------------------------------------------------------------
77 -- Foreign declaractions to RTS entry points which does the real work;
78 -- ---------------------------------------------------------------------------
80 #if __GLASGOW_HASKELL__ >= 504
81 foreign import ccall unsafe "addDLL" c_addDLL :: CString -> IO CString
82 foreign import ccall unsafe "initLinker" initObjLinker :: IO ()
83 foreign import ccall unsafe "lookupSymbol" c_lookupSymbol :: CString -> IO (Ptr a)
84 foreign import ccall unsafe "loadObj" c_loadObj :: CString -> IO Int
85 foreign import ccall unsafe "unloadObj" c_unloadObj :: CString -> IO Int
86 foreign import ccall unsafe "resolveObjs" c_resolveObjs :: IO Int
88 foreign import "addDLL" unsafe c_addDLL :: CString -> IO CString
89 foreign import "initLinker" unsafe initLinker :: IO ()
90 foreign import "lookupSymbol" unsafe c_lookupSymbol :: CString -> IO (Ptr a)
91 foreign import "loadObj" unsafe c_loadObj :: CString -> IO Int
92 foreign import "unloadObj" unsafe c_unloadObj :: CString -> IO Int
93 foreign import "resolveObjs" unsafe c_resolveObjs :: IO Int