diff options
Diffstat (limited to 'compiler/GHC/Driver/Main.hs')
| -rw-r--r-- | compiler/GHC/Driver/Main.hs | 124 |
1 files changed, 64 insertions, 60 deletions
diff --git a/compiler/GHC/Driver/Main.hs b/compiler/GHC/Driver/Main.hs index 255ffaf035..97a47c8df6 100644 --- a/compiler/GHC/Driver/Main.hs +++ b/compiler/GHC/Driver/Main.hs @@ -5,6 +5,7 @@ {-# LANGUAGE GADTs #-} {-# LANGUAGE NamedFieldPuns #-} {-# LANGUAGE TypeApplications #-} +{-# LANGUAGE MultiWayIf #-} {-# OPTIONS_GHC -fprof-auto-top #-} @@ -854,66 +855,69 @@ hscRecompStatus return $ HscRecompNeeded $ fmap (mi_iface_hash . mi_final_exts) mb_checked_iface UpToDateItem checked_iface -> do let lcl_dflags = ms_hspp_opts mod_summary - if not (backendGeneratesCode (backend lcl_dflags)) then - -- No need for a linkable, we're good to go - do msg $ UpToDate - return $ HscUpToDate checked_iface emptyHomeModInfoLinkable - else - -- Do need linkable - do - -- 1. Just check whether we have bytecode/object linkables and then - -- we will decide if we need them or not. - bc_linkable <- checkByteCode checked_iface mod_summary (homeMod_bytecode old_linkable) - obj_linkable <- liftIO $ checkObjects lcl_dflags (homeMod_object old_linkable) mod_summary - trace_if (hsc_logger hsc_env) (vcat [text "BCO linkable", nest 2 (ppr bc_linkable), text "Object Linkable", ppr obj_linkable]) - - let just_bc = justBytecode <$> bc_linkable - just_o = justObjects <$> obj_linkable - _maybe_both_os = case (bc_linkable, obj_linkable) of - (UpToDateItem bc, UpToDateItem o) -> UpToDateItem (bytecodeAndObjects bc o) - -- If missing object code, just say we need to recompile because of object code. - (_, OutOfDateItem reason _) -> OutOfDateItem reason Nothing - -- If just missing byte code, just use the object code - -- so you should use -fprefer-byte-code with -fwrite-if-simplified-core or you'll - -- end up using bytecode on recompilation - (_, UpToDateItem {} ) -> just_o - - definitely_both_os = case (bc_linkable, obj_linkable) of - (UpToDateItem bc, UpToDateItem o) -> UpToDateItem (bytecodeAndObjects bc o) - -- If missing object code, just say we need to recompile because of object code. - (_, OutOfDateItem reason _) -> OutOfDateItem reason Nothing - -- If just missing byte code, just use the object code - -- so you should use -fprefer-byte-code with -fwrite-if-simplified-core or you'll - -- end up using bytecode on recompilation - (OutOfDateItem reason _, _ ) -> OutOfDateItem reason Nothing - --- pprTraceM "recomp" (ppr just_bc <+> ppr just_o) - -- 2. Decide which of the products we will need - let recomp_linkable_result = case () of - _ | backendCanReuseLoadedCode (backend lcl_dflags) -> - case bc_linkable of - -- If bytecode is available for Interactive then don't load object code - UpToDateItem _ -> just_bc - _ -> case obj_linkable of - -- If o is availabe, then just use that - UpToDateItem _ -> just_o - _ -> outOfDateItemBecause MissingBytecode Nothing - -- Need object files for making object files - | backendWritesFiles (backend lcl_dflags) -> - if gopt Opt_ByteCodeAndObjectCode lcl_dflags - -- We say we are going to write both, so recompile unless we have both - then definitely_both_os - -- Only load the object file unless we are saying we need to produce both. - -- Unless we do this then you can end up using byte-code for a module you specify -fobject-code for. - else just_o - | otherwise -> pprPanic "hscRecompStatus" (text $ show $ backend lcl_dflags) - case recomp_linkable_result of - UpToDateItem linkable -> do - msg $ UpToDate - return $ HscUpToDate checked_iface $ linkable - OutOfDateItem reason _ -> do - msg $ NeedsRecompile reason - return $ HscRecompNeeded $ Just $ mi_iface_hash $ mi_final_exts $ checked_iface + if | not (backendGeneratesCode (backend lcl_dflags)) -> do + -- No need for a linkable, we're good to go + msg UpToDate + return $ HscUpToDate checked_iface emptyHomeModInfoLinkable + | not (backendGeneratesCodeForHsBoot (backend lcl_dflags)) + , IsBoot <- isBootSummary mod_summary -> do + msg UpToDate + return $ HscUpToDate checked_iface emptyHomeModInfoLinkable + | otherwise -> do + -- Do need linkable + -- 1. Just check whether we have bytecode/object linkables and then + -- we will decide if we need them or not. + bc_linkable <- checkByteCode checked_iface mod_summary (homeMod_bytecode old_linkable) + obj_linkable <- liftIO $ checkObjects lcl_dflags (homeMod_object old_linkable) mod_summary + trace_if (hsc_logger hsc_env) (vcat [text "BCO linkable", nest 2 (ppr bc_linkable), text "Object Linkable", ppr obj_linkable]) + + let just_bc = justBytecode <$> bc_linkable + just_o = justObjects <$> obj_linkable + _maybe_both_os = case (bc_linkable, obj_linkable) of + (UpToDateItem bc, UpToDateItem o) -> UpToDateItem (bytecodeAndObjects bc o) + -- If missing object code, just say we need to recompile because of object code. + (_, OutOfDateItem reason _) -> OutOfDateItem reason Nothing + -- If just missing byte code, just use the object code + -- so you should use -fprefer-byte-code with -fwrite-if-simplified-core or you'll + -- end up using bytecode on recompilation + (_, UpToDateItem {} ) -> just_o + + definitely_both_os = case (bc_linkable, obj_linkable) of + (UpToDateItem bc, UpToDateItem o) -> UpToDateItem (bytecodeAndObjects bc o) + -- If missing object code, just say we need to recompile because of object code. + (_, OutOfDateItem reason _) -> OutOfDateItem reason Nothing + -- If just missing byte code, just use the object code + -- so you should use -fprefer-byte-code with -fwrite-if-simplified-core or you'll + -- end up using bytecode on recompilation + (OutOfDateItem reason _, _ ) -> OutOfDateItem reason Nothing + +-- pprTraceM "recomp" (ppr just_bc <+> ppr just_o) + -- 2. Decide which of the products we will need + let recomp_linkable_result = case () of + _ | backendCanReuseLoadedCode (backend lcl_dflags) -> + case bc_linkable of + -- If bytecode is available for Interactive then don't load object code + UpToDateItem _ -> just_bc + _ -> case obj_linkable of + -- If o is availabe, then just use that + UpToDateItem _ -> just_o + _ -> outOfDateItemBecause MissingBytecode Nothing + -- Need object files for making object files + | backendWritesFiles (backend lcl_dflags) -> + if gopt Opt_ByteCodeAndObjectCode lcl_dflags + -- We say we are going to write both, so recompile unless we have both + then definitely_both_os + -- Only load the object file unless we are saying we need to produce both. + -- Unless we do this then you can end up using byte-code for a module you specify -fobject-code for. + else just_o + | otherwise -> pprPanic "hscRecompStatus" (text $ show $ backend lcl_dflags) + case recomp_linkable_result of + UpToDateItem linkable -> do + msg $ UpToDate + return $ HscUpToDate checked_iface $ linkable + OutOfDateItem reason _ -> do + msg $ NeedsRecompile reason + return $ HscRecompNeeded $ Just $ mi_iface_hash $ mi_final_exts $ checked_iface -- | Check that the .o files produced by compilation are already up-to-date -- or not. |