2 % (c) The GRASP/AQUA Project, Glasgow University, 1993-2000
4 \section[GHC_Main]{Main driver for Glasgow Haskell compiler}
7 module HscMain ( HscResult(..), hscMain,
8 initPersistentCompilerState ) where
10 #include "HsVersions.h"
12 import Maybe ( isJust )
13 import IO ( hPutStrLn, stderr )
16 import StringBuffer ( hGetStringBuffer )
17 import Parser ( parse )
18 import Lex ( PState(..), ParseResult(..) )
19 import SrcLoc ( mkSrcLoc )
21 import Rename ( renameModule, checkOldIface, closeIfaceDecls )
22 import Rules ( emptyRuleBase )
23 import PrelInfo ( wiredInThingEnv, wiredInThings )
24 import PrelNames ( knownKeyNames )
25 import MkIface ( completeIface, mkModDetailsFromIface, mkModDetails,
27 import TcModule ( TcResults(..), typecheckModule )
28 import InstEnv ( emptyInstEnv )
29 import Desugar ( deSugar )
30 import SimplCore ( core2core )
31 import OccurAnal ( occurAnalyseBinds )
32 import CoreUtils ( coreBindsSize )
33 import CoreTidy ( tidyCorePgm )
34 import CoreToStg ( topCoreBindsToStg )
35 import StgSyn ( collectFinalStgBinders )
36 import SimplStg ( stg2stg )
37 import CodeGen ( codeGen )
38 import CodeOutput ( codeOutput )
40 import Module ( ModuleName, moduleName, mkModuleInThisPackage )
42 import ErrUtils ( dumpIfSet_dyn, showPass )
43 import Util ( unJust )
44 import UniqSupply ( mkSplitUniqSupply )
46 import Bag ( emptyBag )
48 import Interpreter ( UnlinkedIBind, ItblEnv, stgToInterpSyn )
49 import HscStats ( ppSourceStats )
50 import HscTypes ( ModDetails, ModIface(..), PersistentCompilerState(..),
51 PersistentRenamerState(..), ModuleLocation(..),
53 OrigNameEnv(..), PackageRuleBase, HomeIfaceTable,
54 typeEnvClasses, typeEnvTyCons, emptyIfaceTable )
55 import FiniteMap ( FiniteMap, plusFM, emptyFM, addToFM )
56 import OccName ( OccName )
57 import Name ( Name, nameModule, nameOccName, getName )
58 import Name ( emptyNameEnv )
59 import Module ( Module, lookupModuleEnvByName )
64 %************************************************************************
66 \subsection{The main compiler pipeline}
68 %************************************************************************
72 = HscOK ModDetails -- new details (HomeSymbolTable additions)
73 (Maybe ModIface) -- new iface (if any compilation was done)
74 (Maybe String) -- generated stub_h filename (in /tmp)
75 (Maybe String) -- generated stub_c filename (in /tmp)
76 (Maybe ([UnlinkedIBind],ItblEnv)) -- interpreted code, if any
77 PersistentCompilerState -- updated PCS
79 | HscFail PersistentCompilerState -- updated PCS
80 -- no errors or warnings; the individual passes
81 -- (parse/rename/typecheck) print messages themselves
85 -> Bool -- source unchanged?
86 -> ModuleLocation -- location info
87 -> Maybe ModIface -- old interface, if available
88 -> HomeSymbolTable -- for home module ModDetails
90 -> PersistentCompilerState -- IN: persistent compiler state
93 hscMain dflags source_unchanged location maybe_old_iface hst hit pcs
95 putStrLn ("CHECKING OLD IFACE for hs = " ++ show (ml_hs_file location)
96 ++ ", hspp = " ++ show (ml_hspp_file location));
98 (pcs_ch, errs_found, (recomp_reqd, maybe_checked_iface))
99 <- checkOldIface dflags hit hst pcs (unJust (ml_hi_file location) "hscMain")
100 source_unchanged maybe_old_iface;
103 return (HscFail pcs_ch)
106 let no_old_iface = not (isJust maybe_checked_iface)
107 what_next | recomp_reqd || no_old_iface = hscRecomp
108 | otherwise = hscNoRecomp
110 what_next dflags location maybe_checked_iface
115 hscNoRecomp dflags location maybe_checked_iface hst hit pcs_ch
117 hPutStrLn stderr "COMPILATION NOT REQUIRED";
118 -- we definitely expect to have the old interface available
119 let old_iface = case maybe_checked_iface of
120 Just old_if -> old_if
121 Nothing -> panic "hscNoRecomp:old_iface"
122 this_mod = mi_module old_iface
125 (pcs_cl, closure_errs, cl_hs_decls)
126 <- closeIfaceDecls dflags hit hst pcs_ch old_iface ;
128 return (HscFail pcs_cl)
132 maybe_tc_result <- typecheckModule dflags this_mod pcs_cl hst
133 old_iface alwaysQualify cl_hs_decls;
134 case maybe_tc_result of {
135 Nothing -> return (HscFail pcs_cl);
136 Just tc_result -> do {
138 let pcs_tc = tc_pcs tc_result
139 env_tc = tc_env tc_result
140 local_insts = tc_insts tc_result
141 local_rules = tc_rules tc_result
143 -- create a new details from the closed, typechecked, old iface
144 let new_details = mkModDetailsFromIface env_tc local_insts local_rules
146 return (HscOK new_details
147 Nothing -- tells CM to use old iface and linkables
148 Nothing Nothing -- foreign export stuff
154 hscRecomp dflags location maybe_checked_iface hst hit pcs_ch
156 ; hPutStrLn stderr "COMPILATION IS REQUIRED";
158 -- what target are we shooting for?
159 ; let toInterp = dopt_HscLang dflags == HscInterpreted
164 ; maybe_parsed <- myParseModule dflags (unJust (ml_hspp_file location) "hscRecomp:hspp")
165 ; case maybe_parsed of {
166 Nothing -> return (HscFail pcs_ch);
167 Just rdr_module -> do {
168 ; let this_mod = mkModuleInThisPackage (hsModuleName rdr_module)
173 ; (pcs_rn, maybe_rn_result)
174 <- renameModule dflags hit hst pcs_ch this_mod rdr_module
175 ; case maybe_rn_result of {
176 Nothing -> return (HscFail pcs_rn);
177 Just (print_unqualified, new_iface, rn_hs_decls) -> do {
182 ; maybe_tc_result <- typecheckModule dflags this_mod pcs_rn hst new_iface
183 print_unqualified rn_hs_decls
184 ; case maybe_tc_result of {
185 Nothing -> do { hPutStrLn stderr "Typechecked failed"
186 ; return (HscFail pcs_rn) } ;
187 Just tc_result -> do {
189 ; let pcs_tc = tc_pcs tc_result
190 env_tc = tc_env tc_result
191 local_insts = tc_insts tc_result
194 -- DESUGAR, SIMPLIFY, TIDY-CORE
196 -- We grab the the unfoldings at this point.
197 ; simpl_result <- dsThenSimplThenTidy dflags (pcs_rules pcs_tc) this_mod
198 print_unqualified tc_result hst
199 ; let (tidy_binds, orphan_rules, foreign_stuff) = simpl_result
204 ; (stg_binds, oa_tidy_binds, cost_centre_info, top_level_ids)
205 <- myCoreToStg dflags this_mod tidy_binds
209 -- BUILD THE NEW ModDetails AND ModIface
211 ; let new_details = mkModDetails env_tc local_insts tidy_binds
212 top_level_ids orphan_rules
213 ; final_iface <- mkFinalIface dflags location maybe_checked_iface
214 new_iface new_details
217 -- COMPLETE CODE GENERATION
219 ; (maybe_stub_h_filename, maybe_stub_c_filename, maybe_ibinds)
220 <- restOfCodeGeneration dflags toInterp this_mod
221 (map ideclName (hsModuleImports rdr_module))
222 cost_centre_info foreign_stuff env_tc stg_binds oa_tidy_binds
225 -- and the answer is ...
226 ; return (HscOK new_details (Just final_iface)
227 maybe_stub_h_filename maybe_stub_c_filename
233 mkFinalIface dflags location maybe_old_iface new_iface new_details
234 = case completeIface maybe_old_iface new_iface new_details of
235 (new_iface, Nothing) -- no change in the interfacfe
236 -> do if dopt Opt_D_dump_hi_diffs dflags then
237 printDump (text "INTERFACE UNCHANGED")
240 (new_iface, Just sdoc)
241 -> do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "NEW INTERFACE" sdoc
242 -- Write the interface file
243 writeIface (unJust (ml_hi_file location) "hscRecomp:hi") new_iface
247 myParseModule dflags src_filename
248 = do -------------------------- Parser ----------------
249 showPass dflags "Parser"
252 buf <- hGetStringBuffer True{-expand tabs-} src_filename
254 let glaexts | dopt Opt_GlasgowExts dflags = 1#
257 case parse buf PState{ bol = 0#, atbol = 1#,
258 context = [], glasgow_exts = glaexts,
259 loc = mkSrcLoc (_PK_ src_filename) 1 } of {
261 PFailed err -> do { hPutStrLn stderr (showSDoc err);
263 POk _ rdr_module@(HsModule mod_name _ _ _ _ _ _) -> do {
265 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ;
267 dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics"
268 (ppSourceStats False rdr_module) ;
270 return (Just rdr_module)
274 restOfCodeGeneration dflags toInterp this_mod imported_module_names cost_centre_info
275 foreign_stuff env_tc stg_binds oa_tidy_binds
276 hit pit -- these last two for mapping ModNames to Modules
278 = do (ibinds,itbl_env)
279 <- stgToInterpSyn (map fst stg_binds) local_tycons local_classes
280 return (Nothing, Nothing, Just (ibinds,itbl_env))
283 = do -------------------------- Code generation -------------------------------
285 abstractC <- codeGen dflags this_mod imported_modules
286 cost_centre_info fe_binders
287 local_tycons stg_binds
289 -------------------------- Code output -------------------------------
290 -- _scc_ "CodeOutput"
291 (maybe_stub_h_name, maybe_stub_c_name)
292 <- codeOutput dflags this_mod local_tycons
293 oa_tidy_binds stg_binds
294 c_code h_code abstractC
296 return (maybe_stub_h_name, maybe_stub_c_name, Nothing)
298 local_tycons = typeEnvTyCons env_tc
299 local_classes = typeEnvClasses env_tc
300 imported_modules = map mod_name_to_Module imported_module_names
301 (fe_binders,h_code,c_code) = foreign_stuff
303 mod_name_to_Module :: ModuleName -> Module
304 mod_name_to_Module nm
305 = let str_mi = case lookupModuleEnvByName hit nm of
307 Nothing -> case lookupModuleEnvByName pit nm of
311 barf nm = pprPanic "mod_name_to_Module: no hst or pst mapping for"
315 dsThenSimplThenTidy dflags rule_base this_mod print_unqual tc_result hst
316 = do -------------------------- Desugaring ----------------
318 (desugared, rules, h_code, c_code, fe_binders)
319 <- deSugar dflags this_mod print_unqual hst tc_result
321 -------------------------- Main Core-language transformations ----------------
323 (simplified, orphan_rules)
324 <- core2core dflags rule_base hst desugared rules
326 -- Do the final tidy-up
327 (tidy_binds, tidy_orphan_rules)
328 <- tidyCorePgm dflags this_mod simplified orphan_rules
330 return (tidy_binds, tidy_orphan_rules, (fe_binders,h_code,c_code))
333 myCoreToStg dflags this_mod tidy_binds
335 c2s_uniqs <- mkSplitUniqSupply 'c'
336 st_uniqs <- mkSplitUniqSupply 'g'
337 let occ_anal_tidy_binds = occurAnalyseBinds tidy_binds
339 () <- coreBindsSize occ_anal_tidy_binds `seq` return ()
340 -- TEMP: the above call zaps some space usage allocated by the
341 -- simplifier, which for reasons I don't understand, persists
342 -- thoroughout code generation
344 showPass dflags "Core2Stg"
346 let stg_binds = topCoreBindsToStg c2s_uniqs occ_anal_tidy_binds
348 showPass dflags "Stg2Stg"
350 (stg_binds2, cost_centre_info) <- stg2stg dflags this_mod st_uniqs stg_binds
351 let final_ids = collectFinalStgBinders (map fst stg_binds2)
353 return (stg_binds2, occ_anal_tidy_binds, cost_centre_info, final_ids)
357 %************************************************************************
359 \subsection{Initial persistent state}
361 %************************************************************************
364 initPersistentCompilerState :: IO PersistentCompilerState
365 initPersistentCompilerState
366 = do prs <- initPersistentRenamerState
368 PCS { pcs_PIT = emptyIfaceTable,
369 pcs_PTE = wiredInThingEnv,
370 pcs_insts = emptyInstEnv,
371 pcs_rules = emptyRuleBase,
376 initPersistentRenamerState :: IO PersistentRenamerState
377 = do ns <- mkSplitUniqSupply 'r'
379 PRS { prsOrig = Orig { origNames = initOrigNames,
380 origIParam = emptyFM },
381 prsDecls = (emptyNameEnv, 0),
382 prsInsts = (emptyBag, 0),
383 prsRules = (emptyBag, 0),
388 initOrigNames :: FiniteMap (ModuleName,OccName) Name
390 = grab knownKeyNames `plusFM` grab (map getName wiredInThings)
392 grab names = foldl add emptyFM names
394 = addToFM env (moduleName (nameModule name), nameOccName name) name
397 initRules :: PackageRuleBase
398 initRules = emptyRuleBase
400 foldl add emptyVarEnv builtinRules
403 = extendRuleBase env name rule