2 % (c) The University of Glasgow, 2000
4 \section[CmLink]{Linker for GHCI}
7 module CmLink ( Linkable(..), Unlinked(..),
9 modname_of_linkable, is_package_linkable,
12 PersistentLinkerState{-abstractly!-}, emptyPLS )
17 import CmStaticInfo ( PackageConfigInfo )
18 import Module ( ModuleName, PackageName )
19 import Outputable ( SDoc )
20 import Digraph ( SCC(..), flattenSCC )
22 import Panic ( panic )
24 #include "HsVersions.h"
28 data PersistentLinkerState
29 = PersistentLinkerState {
32 -- Current global mapping from RdrNames to closure addresses
33 closure_env :: ClosureEnv,
35 -- the current global mapping from RdrNames of DataCons to
36 -- info table addresses.
37 -- When a new Unlinked is linked into the running image, or an existing
38 -- module in the image is replaced, the itbl_env must be updated
42 -- notionally here, but really lives in the C part of the linker:
43 -- object_symtab :: FiniteMap String Addr
45 dummy :: () -- sigh, can't have an empty record
51 = LinkOK PersistentLinkerState
52 | LinkErrs PersistentLinkerState [SDoc]
58 | Trees [UnlinkedIBind] ItblEnv -- bunch of interpretable bindings, +
59 -- a mapping from DataCons to their itbls
61 instance Outputable Unlinked where
62 ppr (DotO path) = text "DotO" <+> text path
63 ppr (DotA path) = text "DotA" <+> text path
64 ppr (DotDLL path) = text "DotDLL" <+> text path
65 ppr (Trees binds _) = text "Trees" <+> ppr binds
68 isObject (DotO _) = True
69 isObject (DotA _) = True
70 isObject (DotDLL _) = True
73 isInterpretable (Trees _ _) = True
74 isInterpretable _ = False
77 = LM ModuleName [Unlinked]
80 instance Outputable Linkable where
81 ppr (LM mod_nm unlinkeds) = text "LinkableM" <+> ppr mod_nm <+> ppr unlinkeds
82 ppr (LP package_nm) = text "LinkableP" <+> ptext package_nm
84 emptyPLS :: IO PersistentLinkerState
85 emptyPLS = return (PersistentLinkerState { closure_env = emptyClosureEnv,
86 itbl_env = emptyItblEnv })
90 link :: PackageConfigInfo
92 -> PersistentLinkerState
96 --link = panic "CmLink.link: not implemented"
98 = do putStrLn "Hello from the Linker!"
99 putStrLn (showSDoc (vcat (map ppLinkableSCC groups)))
100 putStrLn "Bye-bye from the Linker!"
103 ppLinkableSCC :: SCC Linkable -> SDoc
104 ppLinkableSCC = ppr . flattenSCC
109 link pci [] pls = return (LinkOK pls)
110 link pci (groupSCC:groups) pls = do
111 let group = flattenSCC groupSCC
112 -- the group is either all objects or all interpretable, for now
113 if all isObject group
114 then do mapM loadObj [ file | DotO file <- group ]
117 else if all isInterpretable group
118 then do (new_closure_env, new_itbl_env) <-
119 linkIModules (closure_env pls)
121 [ trees | Trees trees <- group ]
122 link pci groups (PersistentLinkerState{
123 closure_env=new_closure_env,
124 itbl_env=new_itbl_env})
126 return (LinkErrs pls (ptext SLIT("linker: group must contain all objects or all interpreted modules")))
130 modname_of_linkable (LM nm _) = nm
131 modname_of_linkable (LP _) = panic "modname_of_linkable: package"
133 is_package_linkable (LP _) = True
134 is_package_linkable (LM _ _) = False
136 filterModuleLinkables :: (ModuleName -> Bool)
139 filterModuleLinkables p [] = []
140 filterModuleLinkables p (li:lis)
143 LM modnm _ -> if p modnm then retain else dump
145 dump = filterModuleLinkables p lis