\section[GHC_Main]{Main driver for Glasgow Haskell compiler}
\begin{code}
-module HscMain (
- HscResult(..),
- hscMain, newHscEnv, hscCmmFile,
- hscFileCheck,
- hscParseIdentifier,
+module HscMain
+ ( newHscEnv, hscCmmFile
+ , hscFileCheck
+ , hscParseIdentifier
#ifdef GHCI
- hscStmt, hscTcExpr, hscKcType,
- compileExpr,
+ , hscStmt, hscTcExpr, hscKcType
+ , compileExpr
#endif
- hscCompileOneShot -- :: Compiler HscStatus
- , hscCompileMake -- :: Compiler (HscStatus, ModIface, ModDetails)
- , hscCompileInteractive -- :: Compiler (InteractiveStatus, ModIface, ModDetails)
- , HscStatus (..)
- , InteractiveStatus (..)
- ) where
+ , hscCompileOneShot -- :: Compiler HscStatus
+ , hscCompileMake -- :: Compiler (HscStatus, ModIface, ModDetails)
+ , hscCompileInteractive -- :: Compiler (InteractiveStatus, ModIface, ModDetails)
+ , HscStatus (..)
+ , InteractiveStatus (..)
+ , HscChecked (..)
+ ) where
#include "HsVersions.h"
error. This is the only thing that isn't caught by the type-system.
\begin{code}
-data HscResult
- -- Compilation failed
- = HscFail
- -- In IDE mode: we just do the static/dynamic checks
- | HscChecked
+data HscChecked
+ = HscChecked
-- parsed
- (Located (HsModule RdrName))
+ (Located (HsModule RdrName))
-- renamed
- (Maybe (HsGroup Name,[LImportDecl Name],Maybe [LIE Name]))
+ (Maybe (HsGroup Name,[LImportDecl Name],Maybe [LIE Name]))
-- typechecked
- (Maybe (LHsBinds Id, GlobalRdrEnv, ModDetails))
+ (Maybe (LHsBinds Id, GlobalRdrEnv, ModDetails))
- -- Concluded that it wasn't necessary
- | HscNoRecomp ModDetails -- new details (HomeSymbolTable additions)
- ModIface -- new iface (if any compilation was done)
-
- -- Did recompilation
- | HscRecomp ModDetails -- new details (HomeSymbolTable additions)
- ModIface -- new iface (if any compilation was done)
- Bool -- stub_h exists
- Bool -- stub_c exists
- (Maybe CompiledByteCode)
-
-
--- What to do when we have compiler error or warning messages
-type MessageAction = Messages -> IO ()
-
-
---------------------------------------------------------------
--- Exterimental code start.
---------------------------------------------------------------
data HscStatus
= NewHscNoRecomp
#endif
-
---------------------------------------------------------------
--- Exterimental code end.
---------------------------------------------------------------
-
- -- no errors or warnings; the individual passes
- -- (parse/rename/typecheck) print messages themselves
-
-hscMain
- :: HscEnv
- -> ModSummary
- -> Bool -- True <=> source unchanged
- -> Bool -- True <=> have an object file (for msgs only)
- -> Maybe ModIface -- Old interface, if available
- -> Maybe (Int, Int) -- Just (i,n) <=> module i of n (for msgs)
- -> IO HscResult
-
-hscMain hsc_env mod_summary
- source_unchanged have_object maybe_old_iface
- mb_mod_index
- = do {
- (recomp_reqd, maybe_checked_iface) <-
- {-# SCC "checkOldIface" #-}
- checkOldIface hsc_env mod_summary
- source_unchanged maybe_old_iface;
-
- let no_old_iface = not (isJust maybe_checked_iface)
- what_next | recomp_reqd || no_old_iface = hscRecomp
- | otherwise = hscNoRecomp
-
- ; what_next hsc_env mod_summary have_object
- maybe_checked_iface
- mb_mod_index
- }
-
-
-------------------------------
-hscNoRecomp hsc_env mod_summary
- have_object (Just old_iface)
- mb_mod_index
- | isOneShot (ghcMode (hsc_dflags hsc_env))
- = do {
- compilationProgressMsg (hsc_dflags hsc_env) $
- "compilation IS NOT required";
- dumpIfaceStats hsc_env ;
-
- let { bomb = panic "hscNoRecomp:OneShot" };
- return (HscNoRecomp bomb bomb)
- }
- | otherwise
- = do { compilationProgressMsg (hsc_dflags hsc_env) $
- (showModuleIndex mb_mod_index ++
- "Skipping " ++ showModMsg have_object mod_summary)
-
- ; new_details <- {-# SCC "tcRnIface" #-}
- initIfaceCheck hsc_env $
- typecheckIface old_iface ;
- ; dumpIfaceStats hsc_env
-
- ; return (HscNoRecomp new_details old_iface)
- }
-
-hscNoRecomp hsc_env mod_summary
- have_object Nothing
- mb_mod_index
- = panic "hscNoRecomp" -- hscNoRecomp definitely expects to
- -- have the old interface available
-
-------------------------------
-hscRecomp hsc_env mod_summary
- have_object maybe_old_iface
- mb_mod_index
- = case ms_hsc_src mod_summary of
- HsSrcFile -> do
- front_res <- hscFileFrontEnd hsc_env mod_summary mb_mod_index
- case ghcMode (hsc_dflags hsc_env) of
- JustTypecheck -> hscBootBackEnd hsc_env mod_summary maybe_old_iface front_res
- _ -> hscBackEnd hsc_env mod_summary maybe_old_iface front_res
-
- HsBootFile -> do
- front_res <- hscFileFrontEnd hsc_env mod_summary mb_mod_index
- hscBootBackEnd hsc_env mod_summary maybe_old_iface front_res
-
- ExtCoreFile -> do
- front_res <- hscCoreFrontEnd hsc_env mod_summary mb_mod_index
- hscBackEnd hsc_env mod_summary maybe_old_iface front_res
-
+hscCoreFrontEnd :: FrontEnd ModGuts
hscCoreFrontEnd hsc_env mod_summary mb_mod_index = do {
-------------------
-- PARSE
Just mod_guts -> return (Just mod_guts) -- No desugaring to do!
}}
-
+hscFileFrontEnd :: FrontEnd ModGuts
hscFileFrontEnd hsc_env mod_summary mb_mod_index = do {
-------------------
-- DISPLAY PROGRESS MESSAGE
------------------------------
-hscFileCheck :: HscEnv -> ModSummary -> IO HscResult
+hscFileCheck :: HscEnv -> ModSummary -> IO (Maybe HscChecked)
hscFileCheck hsc_env mod_summary = do {
-------------------
-- PARSE
; case maybe_parsed of {
Left err -> do { printBagOfErrors dflags (unitBag err)
- ; return HscFail } ;
+ ; return Nothing } ;
Right rdr_module -> do {
-------------------
; printErrorsAndWarnings dflags tc_msgs
; case maybe_tc_result of {
- Nothing -> return (HscChecked rdr_module Nothing Nothing);
+ Nothing -> return (Just (HscChecked rdr_module Nothing Nothing));
Just tc_result -> do
let md = ModDetails {
md_types = tcg_type_env tc_result,
imports <- tcg_rn_imports tc_result
let exports = tcg_rn_exports tc_result
return (decl,imports,exports)
- return (HscChecked rdr_module
+ return (Just (HscChecked rdr_module
rnInfo
(Just (tcg_binds tc_result,
tcg_rdr_env tc_result,
- md)))
+ md))))
}}}}
-------------------------------
-hscBootBackEnd :: HscEnv -> ModSummary -> Maybe ModIface -> Maybe ModGuts -> IO HscResult
--- For hs-boot files, there's no code generation to do
-
-hscBootBackEnd hsc_env mod_summary maybe_old_iface Nothing
- = return HscFail
-hscBootBackEnd hsc_env mod_summary maybe_old_iface (Just ds_result)
- = do { details <- mkBootModDetails hsc_env ds_result
-
- ; (new_iface, no_change)
- <- {-# SCC "MkFinalIface" #-}
- mkIface hsc_env maybe_old_iface ds_result details
-
- ; writeIfaceFile hsc_env (ms_location mod_summary) new_iface no_change
-
- -- And the answer is ...
- ; dumpIfaceStats hsc_env
-
- ; return (HscRecomp details new_iface
- False False Nothing)
- }
-
-------------------------------
-hscBackEnd :: HscEnv -> ModSummary -> Maybe ModIface -> Maybe ModGuts -> IO HscResult
-
-hscBackEnd hsc_env mod_summary maybe_old_iface Nothing
- = return HscFail
-
-hscBackEnd hsc_env mod_summary maybe_old_iface (Just ds_result)
- = do { -- OMITTED:
- -- ; seqList imported_modules (return ())
-
- let one_shot = isOneShot (ghcMode dflags)
- dflags = hsc_dflags hsc_env
-
- -------------------
- -- FLATTENING
- -------------------
- ; flat_result <- {-# SCC "Flattening" #-}
- flatten hsc_env ds_result
-
-
-{- TEMP: need to review space-leak fixing here
- NB: even the code generator can force one of the
- thunks for constructor arguments, for newtypes in particular
-
- ; let -- Rule-base accumulated from imported packages
- pkg_rule_base = eps_rule_base (hsc_EPS hsc_env)
-
- -- In one-shot mode, ZAP the external package state at
- -- this point, because we aren't going to need it from
- -- now on. We keep the name cache, however, because
- -- tidyCore needs it.
- pcs_middle
- | one_shot = pcs_tc{ pcs_EPS = error "pcs_EPS missing" }
- | otherwise = pcs_tc
-
- ; pkg_rule_base `seq` pcs_middle `seq` return ()
--}
-
- -- alive at this point:
- -- pcs_middle
- -- flat_result
- -- pkg_rule_base
-
- -------------------
- -- SIMPLIFY
- -------------------
- ; simpl_result <- {-# SCC "Core2Core" #-}
- core2core hsc_env flat_result
-
- -------------------
- -- TIDY
- -------------------
- ; (cg_guts, details) <- {-# SCC "CoreTidy" #-}
- tidyProgram hsc_env simpl_result
-
- -- Alive at this point:
- -- tidy_result, pcs_final
- -- hsc_env
-
- -------------------
- -- BUILD THE NEW ModIface and ModDetails
- -- and emit external core if necessary
- -- This has to happen *after* code gen so that the back-end
- -- info has been set. Not yet clear if it matters waiting
- -- until after code output
- ; (new_iface, no_change)
- <- {-# SCC "MkFinalIface" #-}
- mkIface hsc_env maybe_old_iface simpl_result details
-
- ; writeIfaceFile hsc_env (ms_location mod_summary) new_iface no_change
-
- -- Space leak reduction: throw away the new interface if
- -- we're in one-shot mode; we won't be needing it any
- -- more.
- ; final_iface <- if one_shot then return (error "no final iface")
- else return new_iface
-
- -- Build the final ModDetails (except in one-shot mode, where
- -- we won't need this information after compilation).
- ; final_details <- if one_shot then return (error "no final details")
- else return $! details
-
- -- Emit external core
- ; emitExternalCore dflags cg_guts
-
- -------------------
- -- CONVERT TO STG and COMPLETE CODE GENERATION
- ; (stub_h_exists, stub_c_exists, maybe_bcos)
- <- hscCodeGen dflags (ms_location mod_summary) cg_guts
-
- -- And the answer is ...
- ; dumpIfaceStats hsc_env
-
- ; return (HscRecomp final_details
- final_iface
- stub_h_exists stub_c_exists
- maybe_bcos)
- }
-
-
-
-hscCodeGen dflags location
- CgGuts{ -- This is the last use of the ModGuts in a compilation.
- -- From now on, we just use the bits we need.
- cg_module = this_mod,
- cg_binds = core_binds,
- cg_tycons = tycons,
- cg_dir_imps = dir_imps,
- cg_foreign = foreign_stubs,
- cg_home_mods = home_mods,
- cg_dep_pkgs = dependencies } = do {
-
- let { data_tycons = filter isDataTyCon tycons } ;
- -- cg_tycons includes newtypes, for the benefit of External Core,
- -- but we don't generate any code for newtypes
-
- -------------------
- -- PREPARE FOR CODE GENERATION
- -- Do saturation and convert to A-normal form
- prepd_binds <- {-# SCC "CorePrep" #-}
- corePrepPgm dflags core_binds data_tycons ;
-
- case hscTarget dflags of
- HscNothing -> return (False, False, Nothing)
-
- HscInterpreted ->
-#ifdef GHCI
- do ----------------- Generate byte code ------------------
- comp_bc <- byteCodeGen dflags prepd_binds data_tycons
-
- ------------------ Create f-x-dynamic C-side stuff ---
- (istub_h_exists, istub_c_exists)
- <- outputForeignStubs dflags this_mod location foreign_stubs
-
- return ( istub_h_exists, istub_c_exists, Just comp_bc )
-#else
- panic "GHC not compiled with interpreter"
-#endif
-
- other ->
- do
- ----------------- Convert to STG ------------------
- (stg_binds, cost_centre_info) <- {-# SCC "CoreToStg" #-}
- myCoreToStg dflags home_mods this_mod prepd_binds
-
- ------------------ Code generation ------------------
- abstractC <- {-# SCC "CodeGen" #-}
- codeGen dflags home_mods this_mod data_tycons
- foreign_stubs dir_imps cost_centre_info
- stg_binds
-
- ------------------ Code output -----------------------
- (stub_h_exists, stub_c_exists)
- <- codeOutput dflags this_mod location foreign_stubs
- dependencies abstractC
-
- return (stub_h_exists, stub_c_exists, Nothing)
- }
-
hscCmmFile :: DynFlags -> FilePath -> IO Bool
hscCmmFile dflags filename = do
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