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,
11 initPersistentCompilerState ) where
13 #include "HsVersions.h"
16 import RdrHsSyn ( RdrNameHsExpr )
17 import CoreToStg ( coreToStgExpr )
18 import StringBuffer ( stringToStringBuffer, freeStringBuffer )
19 import Unique ( Uniquable(..) )
20 import Type ( splitTyConApp_maybe )
21 import PrelNames ( ioTyConKey )
26 import StringBuffer ( hGetStringBuffer )
28 import Lex ( PState(..), ParseResult(..) )
29 import SrcLoc ( mkSrcLoc )
31 import Rules ( emptyRuleBase )
32 import PrelInfo ( wiredInThingEnv, wiredInThings )
33 import PrelNames ( knownKeyNames )
34 import MkIface ( completeIface, mkModDetailsFromIface, mkModDetails,
35 writeIface, pprIface )
38 import InstEnv ( emptyInstEnv )
41 import CoreUtils ( coreBindsSize )
42 import CoreTidy ( tidyCorePgm )
43 import CoreToStg ( topCoreBindsToStg )
44 import StgSyn ( collectFinalStgBinders )
45 import SimplStg ( stg2stg )
46 import CodeGen ( codeGen )
47 import CodeOutput ( codeOutput )
49 import Module ( ModuleName, moduleName, mkHomeModule )
51 import ErrUtils ( dumpIfSet_dyn, showPass )
52 import Util ( unJust )
53 import UniqSupply ( mkSplitUniqSupply )
55 import Bag ( emptyBag )
58 import CmStaticInfo ( GhciMode(..) )
59 import HscStats ( ppSourceStats )
60 import HscTypes ( ModDetails, ModIface(..), PersistentCompilerState(..),
61 PersistentRenamerState(..), ModuleLocation(..),
63 OrigNameEnv(..), PackageRuleBase, HomeIfaceTable,
64 typeEnvClasses, typeEnvTyCons, emptyIfaceTable )
65 import FiniteMap ( FiniteMap, plusFM, emptyFM, addToFM )
66 import OccName ( OccName )
67 import Name ( Name, nameModule, nameOccName, getName )
68 import Name ( emptyNameEnv )
69 import Module ( Module, lookupModuleEnvByName )
72 import Maybe ( isJust )
73 import IO ( hPutStrLn, stderr )
77 %************************************************************************
79 \subsection{The main compiler pipeline}
81 %************************************************************************
86 = HscFail PersistentCompilerState -- updated PCS
87 -- concluded that it wasn't necessary
88 | HscNoRecomp PersistentCompilerState -- updated PCS
89 ModDetails -- new details (HomeSymbolTable additions)
90 ModIface -- new iface (if any compilation was done)
92 | HscRecomp PersistentCompilerState -- updated PCS
93 ModDetails -- new details (HomeSymbolTable additions)
94 ModIface -- new iface (if any compilation was done)
95 (Maybe String) -- generated stub_h filename (in /tmp)
96 (Maybe String) -- generated stub_c filename (in /tmp)
97 (Maybe ([UnlinkedIBind],ItblEnv)) -- interpreted code, if any
100 -- no errors or warnings; the individual passes
101 -- (parse/rename/typecheck) print messages themselves
106 -> Bool -- source unchanged?
107 -> ModuleLocation -- location info
108 -> Maybe ModIface -- old interface, if available
109 -> HomeSymbolTable -- for home module ModDetails
111 -> PersistentCompilerState -- IN: persistent compiler state
114 hscMain ghci_mode dflags source_unchanged location maybe_old_iface hst hit pcs
116 showPass dflags ("Checking old interface for hs = "
117 ++ show (ml_hs_file location)
118 ++ ", hspp = " ++ show (ml_hspp_file location));
120 (pcs_ch, errs_found, (recomp_reqd, maybe_checked_iface))
121 <- checkOldIface dflags hit hst pcs
122 (unJust "hscMain" (ml_hi_file location))
123 source_unchanged maybe_old_iface;
126 return (HscFail pcs_ch)
129 let no_old_iface = not (isJust maybe_checked_iface)
130 what_next | recomp_reqd || no_old_iface = hscRecomp
131 | otherwise = hscNoRecomp
133 what_next ghci_mode dflags location maybe_checked_iface
138 -- we definitely expect to have the old interface available
139 hscNoRecomp ghci_mode dflags location (Just old_iface) hst hit pcs_ch
140 | ghci_mode == OneShot
141 = let bomb = panic "hscNoRecomp:OneShot"
142 in return (HscNoRecomp pcs_ch bomb bomb)
145 hPutStrLn stderr "compilation IS NOT required";
148 (pcs_cl, closure_errs, cl_hs_decls)
149 <- closeIfaceDecls dflags hit hst pcs_ch old_iface ;
151 return (HscFail pcs_cl)
155 maybe_tc_result <- typecheckModule dflags pcs_cl hst
156 old_iface alwaysQualify cl_hs_decls;
157 case maybe_tc_result of {
158 Nothing -> return (HscFail pcs_cl);
159 Just (pcs_tc, tc_result) -> do {
161 let env_tc = tc_env tc_result
162 local_rules = tc_rules tc_result
164 -- create a new details from the closed, typechecked, old iface
165 let new_details = mkModDetailsFromIface env_tc local_rules
167 return (HscNoRecomp pcs_tc new_details old_iface)
171 hscRecomp ghci_mode dflags location maybe_checked_iface hst hit pcs_ch
173 ; when (verbosity dflags >= 1) $
174 hPutStrLn stderr "compilation IS required";
176 -- what target are we shooting for?
177 ; let toInterp = dopt_HscLang dflags == HscInterpreted
182 ; maybe_parsed <- myParseModule dflags
183 (unJust "hscRecomp:hspp" (ml_hspp_file location))
184 ; case maybe_parsed of {
185 Nothing -> return (HscFail pcs_ch);
186 Just rdr_module -> do {
187 ; let this_mod = mkHomeModule (hsModuleName rdr_module)
192 ; (pcs_rn, maybe_rn_result)
193 <- renameModule dflags hit hst pcs_ch this_mod rdr_module
194 ; case maybe_rn_result of {
195 Nothing -> return (HscFail pcs_rn);
196 Just (print_unqualified, (is_exported, new_iface, rn_hs_decls)) -> do {
201 ; maybe_tc_result <- typecheckModule dflags pcs_rn hst new_iface
202 print_unqualified rn_hs_decls
203 ; case maybe_tc_result of {
204 Nothing -> return (HscFail pcs_rn);
205 Just (pcs_tc, tc_result) -> do {
207 ; let env_tc = tc_env tc_result
210 -- DESUGAR, SIMPLIFY, TIDY-CORE
212 -- We grab the the unfoldings at this point.
213 ; simpl_result <- dsThenSimplThenTidy dflags pcs_tc hst this_mod
214 print_unqualified is_exported tc_result
215 ; let (pcs_simpl, tidy_binds, orphan_rules, foreign_stuff) = simpl_result
220 ; (stg_binds, cost_centre_info, top_level_ids)
221 <- myCoreToStg dflags this_mod tidy_binds
225 -- BUILD THE NEW ModDetails AND ModIface
227 ; let new_details = mkModDetails env_tc tidy_binds
228 top_level_ids orphan_rules
229 ; final_iface <- mkFinalIface ghci_mode dflags location
230 maybe_checked_iface new_iface new_details
233 -- COMPLETE CODE GENERATION
235 ; (maybe_stub_h_filename, maybe_stub_c_filename, maybe_ibinds)
236 <- restOfCodeGeneration dflags toInterp this_mod
237 (map ideclName (hsModuleImports rdr_module))
238 cost_centre_info foreign_stuff env_tc stg_binds tidy_binds
239 hit (pcs_PIT pcs_simpl)
241 -- and the answer is ...
242 ; return (HscRecomp pcs_simpl new_details final_iface
243 maybe_stub_h_filename maybe_stub_c_filename
249 mkFinalIface ghci_mode dflags location maybe_old_iface new_iface new_details
250 = case completeIface maybe_old_iface new_iface new_details of
251 (new_iface, Nothing) -- no change in the interfacfe
252 -> do when (dopt Opt_D_dump_hi_diffs dflags)
253 (printDump (text "INTERFACE UNCHANGED"))
254 dumpIfSet_dyn dflags Opt_D_dump_hi
255 "UNCHANGED FINAL INTERFACE" (pprIface new_iface)
257 (new_iface, Just sdoc_diffs)
258 -> do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "INTERFACE HAS CHANGED"
260 dumpIfSet_dyn dflags Opt_D_dump_hi "NEW FINAL INTERFACE"
262 -- Write the interface file
263 when (ghci_mode /= Interactive)
264 (writeIface (unJust "hscRecomp:hi" (ml_hi_file location))
269 myParseModule dflags src_filename
270 = do -------------------------- Parser ----------------
271 showPass dflags "Parser"
274 buf <- hGetStringBuffer True{-expand tabs-} src_filename
276 let glaexts | dopt Opt_GlasgowExts dflags = 1#
279 case parse buf PState{ bol = 0#, atbol = 1#,
280 context = [], glasgow_exts = glaexts,
281 loc = mkSrcLoc (_PK_ src_filename) 1 } of {
283 PFailed err -> do { hPutStrLn stderr (showSDoc err);
286 POk _ (PModule rdr_module@(HsModule mod_name _ _ _ _ _ _)) -> do {
288 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ;
290 dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics"
291 (ppSourceStats False rdr_module) ;
293 return (Just rdr_module)
297 restOfCodeGeneration dflags toInterp this_mod imported_module_names cost_centre_info
298 foreign_stuff env_tc stg_binds tidy_binds
299 hit pit -- these last two for mapping ModNames to Modules
301 = do (ibinds,itbl_env)
302 <- stgBindsToInterpSyn dflags (map fst stg_binds)
303 local_tycons local_classes
304 return (Nothing, Nothing, Just (ibinds,itbl_env))
307 = do -------------------------- Code generation -------------------------------
309 abstractC <- codeGen dflags this_mod imported_modules
310 cost_centre_info fe_binders
311 local_tycons stg_binds
313 -------------------------- Code output -------------------------------
314 -- _scc_ "CodeOutput"
315 (maybe_stub_h_name, maybe_stub_c_name)
316 <- codeOutput dflags this_mod local_tycons
318 c_code h_code abstractC
320 return (maybe_stub_h_name, maybe_stub_c_name, Nothing)
322 local_tycons = typeEnvTyCons env_tc
323 local_classes = typeEnvClasses env_tc
324 imported_modules = map mod_name_to_Module imported_module_names
325 (fe_binders,h_code,c_code) = foreign_stuff
327 mod_name_to_Module :: ModuleName -> Module
328 mod_name_to_Module nm
329 = let str_mi = case lookupModuleEnvByName hit nm of
331 Nothing -> case lookupModuleEnvByName pit nm of
335 barf nm = pprPanic "mod_name_to_Module: no hst or pst mapping for"
339 dsThenSimplThenTidy dflags pcs hst this_mod print_unqual is_exported tc_result
340 = do -------------------------- Desugaring ----------------
342 (desugared, rules, h_code, c_code, fe_binders)
343 <- deSugar dflags pcs hst this_mod print_unqual tc_result
345 -------------------------- Main Core-language transformations ----------------
347 (simplified, orphan_rules)
348 <- core2core dflags pcs hst is_exported desugared rules
350 -- Do the final tidy-up
351 (pcs', tidy_binds, tidy_orphan_rules)
352 <- tidyCorePgm dflags this_mod pcs simplified orphan_rules
354 return (pcs', tidy_binds, tidy_orphan_rules, (fe_binders,h_code,c_code))
357 myCoreToStg dflags this_mod tidy_binds
359 () <- coreBindsSize tidy_binds `seq` return ()
360 -- TEMP: the above call zaps some space usage allocated by the
361 -- simplifier, which for reasons I don't understand, persists
362 -- thoroughout code generation
365 stg_binds <- topCoreBindsToStg dflags this_mod tidy_binds
368 (stg_binds2, cost_centre_info) <- stg2stg dflags this_mod stg_binds
369 let final_ids = collectFinalStgBinders (map fst stg_binds2)
371 return (stg_binds2, cost_centre_info, final_ids)
375 %************************************************************************
377 \subsection{Compiling an expression}
379 %************************************************************************
383 hscExpr dflags hst hit pcs this_module expr
384 = panic "hscExpr: non-interactive build"
385 hscTypeExpr dflags hst hit pcs0 this_module expr
386 = panic "hscTypeExpr: non-interactive build"
393 -> PersistentCompilerState -- IN: persistent compiler state
394 -> Module -- Context for compiling
395 -> String -- The expression
396 -> IO ( PersistentCompilerState, Maybe UnlinkedIExpr )
398 hscExpr dflags hst hit pcs0 this_module expr
400 -- parse, rename & typecheck the expression
401 (pcs1, maybe_tc_result)
402 <- hscExprFrontEnd dflags hst hit pcs0 this_module expr;
404 case maybe_tc_result of {
405 Nothing -> return (pcs1, Nothing);
406 Just (print_unqual, tc_expr, ty) -> do {
408 -- if it isn't an IO-typed expression,
409 -- wrap "print" around it & recompile...
410 let { is_IO_type = case splitTyConApp_maybe ty of {
411 Just (tycon, _) -> getUnique tycon == ioTyConKey;
416 then hscExpr dflags hst hit pcs1 this_module
417 ("print (" ++ expr ++ ")")
421 ds_expr <- deSugarExpr dflags pcs1 hst this_module
422 print_unqual tc_expr;
425 simpl_expr <- simplifyExpr dflags pcs1 hst ds_expr;
428 stg_expr <- coreToStgExpr dflags simpl_expr;
430 -- ToDo: need to do StgVarInfo? or SRTs?
432 -- Convert to InterpSyn
433 unlinked_iexpr <- stgExprToInterpSyn dflags stg_expr;
435 return (pcs1, Just unlinked_iexpr);
442 -> PersistentCompilerState -- IN: persistent compiler state
443 -> Module -- Context for compiling
444 -> String -- The expression
445 -> IO ( PersistentCompilerState,
446 Maybe (PrintUnqualified,TypecheckedHsExpr,Type)
448 hscExprFrontEnd dflags hst hit pcs0 this_module expr
450 maybe_parsed <- hscParseExpr dflags expr;
452 Nothing -> return (pcs0, Nothing)
453 Just parsed_expr -> do {
456 (pcs1, maybe_renamed_expr) <-
457 renameExpr dflags hit hst pcs0 this_module parsed_expr;
458 case maybe_renamed_expr of
459 Nothing -> return (pcs1, Nothing)
460 Just (print_unqual, rn_expr) -> do {
464 <- typecheckExpr dflags pcs1 hst print_unqual this_module rn_expr;
465 case maybe_tc_return of
466 Nothing -> return (pcs1, Nothing)
467 Just (pcs2, tc_expr, ty) ->
468 return (pcs2, Just (print_unqual, tc_expr, ty))
475 -> PersistentCompilerState -- IN: persistent compiler state
476 -> Module -- Context for compiling
477 -> String -- The expression
478 -> IO (PersistentCompilerState, Maybe (PrintUnqualified, Type))
479 hscTypeExpr dflags hst hit pcs0 this_module expr
480 = do (pcs1, maybe_tc_result)
481 <- hscExprFrontEnd dflags hst hit pcs0 this_module expr
482 case maybe_tc_result of
483 Nothing -> return (pcs1, Nothing)
484 Just (print_unqual,_,ty) -> return (pcs1, Just (print_unqual,ty))
486 hscParseExpr :: DynFlags -> String -> IO (Maybe RdrNameHsExpr)
487 hscParseExpr dflags str
488 = do -------------------------- Parser ----------------
489 showPass dflags "Parser"
492 buf <- stringToStringBuffer ("__expr " ++ str)
494 -- glaexts is True for now (because of the daft __expr at the front
497 --let glaexts | dopt Opt_GlasgowExts dflags = 1#
500 case parse buf PState{ bol = 0#, atbol = 1#,
501 context = [], glasgow_exts = glaexts,
502 loc = mkSrcLoc SLIT("<no file>") 0 } of {
504 PFailed err -> do { freeStringBuffer buf;
505 hPutStrLn stderr (showSDoc err);
508 POk _ (PExpr rdr_expr) -> do {
510 --ToDo: can't free the string buffer until we've finished this
511 -- compilation sweep and all the identifiers have gone away.
512 --freeStringBuffer buf;
513 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_expr);
514 return (Just rdr_expr)
519 %************************************************************************
521 \subsection{Initial persistent state}
523 %************************************************************************
526 initPersistentCompilerState :: IO PersistentCompilerState
527 initPersistentCompilerState
528 = do prs <- initPersistentRenamerState
530 PCS { pcs_PIT = emptyIfaceTable,
531 pcs_PTE = wiredInThingEnv,
532 pcs_insts = emptyInstEnv,
533 pcs_rules = emptyRuleBase,
538 initPersistentRenamerState :: IO PersistentRenamerState
539 = do ns <- mkSplitUniqSupply 'r'
541 PRS { prsOrig = Orig { origNames = initOrigNames,
542 origIParam = emptyFM },
543 prsDecls = (emptyNameEnv, 0),
544 prsInsts = (emptyBag, 0),
545 prsRules = (emptyBag, 0),
550 initOrigNames :: FiniteMap (ModuleName,OccName) Name
552 = grab knownKeyNames `plusFM` grab (map getName wiredInThings)
554 grab names = foldl add emptyFM names
556 = addToFM env (moduleName (nameModule name), nameOccName name) name
559 initRules :: PackageRuleBase
560 initRules = emptyRuleBase
562 foldl add emptyVarEnv builtinRules
565 = extendRuleBase env name rule