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 Rename ( renameExpr )
18 import CoreToStg ( coreExprToStg )
19 import StringBuffer ( stringToStringBuffer, freeStringBuffer )
20 import Unique ( Uniquable(..) )
21 import Type ( splitTyConApp_maybe )
22 import PrelNames ( ioTyConKey )
23 import ByteCodeGen ( byteCodeGen )
28 import StringBuffer ( hGetStringBuffer )
30 import Lex ( PState(..), ParseResult(..) )
31 import SrcLoc ( mkSrcLoc )
32 import Rename ( checkOldIface, renameModule, closeIfaceDecls )
33 import Rules ( emptyRuleBase )
34 import PrelInfo ( wiredInThingEnv, wiredInThings )
35 import PrelNames ( knownKeyNames )
36 import MkIface ( completeIface, mkModDetailsFromIface, mkModDetails,
37 writeIface, pprIface )
39 import InstEnv ( emptyInstEnv )
42 import CoreUtils ( coreBindsSize )
43 import CoreTidy ( tidyCorePgm )
45 import CoreToStg ( coreToStg )
46 import SimplStg ( stg2stg )
47 import CodeGen ( codeGen )
48 import CodeOutput ( codeOutput )
50 import Module ( ModuleName, moduleName, mkHomeModule )
52 import ErrUtils ( dumpIfSet_dyn, showPass )
53 import Util ( unJust )
54 import UniqSupply ( mkSplitUniqSupply )
56 import Bag ( emptyBag )
59 import CmStaticInfo ( GhciMode(..) )
60 import HscStats ( ppSourceStats )
61 import HscTypes ( ModDetails, ModIface(..), PersistentCompilerState(..),
62 PersistentRenamerState(..), ModuleLocation(..),
64 NameSupply(..), PackageRuleBase, HomeIfaceTable,
65 typeEnvClasses, typeEnvTyCons, emptyIfaceTable )
66 import FiniteMap ( FiniteMap, plusFM, emptyFM, addToFM )
67 import OccName ( OccName )
68 import Name ( Name, nameModule, nameOccName, getName )
69 import Name ( emptyNameEnv )
70 import Module ( Module, lookupModuleEnvByName )
73 import Maybe ( isJust )
78 %************************************************************************
80 \subsection{The main compiler pipeline}
82 %************************************************************************
87 = HscFail PersistentCompilerState -- updated PCS
88 -- concluded that it wasn't necessary
89 | HscNoRecomp PersistentCompilerState -- updated PCS
90 ModDetails -- new details (HomeSymbolTable additions)
91 ModIface -- new iface (if any compilation was done)
93 | HscRecomp PersistentCompilerState -- updated PCS
94 ModDetails -- new details (HomeSymbolTable additions)
95 ModIface -- new iface (if any compilation was done)
96 (Maybe String) -- generated stub_h filename (in /tmp)
97 (Maybe String) -- generated stub_c filename (in /tmp)
98 (Maybe ([UnlinkedIBind],ItblEnv)) -- interpreted code, if any
101 -- no errors or warnings; the individual passes
102 -- (parse/rename/typecheck) print messages themselves
107 -> Bool -- source unchanged?
108 -> ModuleLocation -- location info
109 -> Maybe ModIface -- old interface, if available
110 -> HomeSymbolTable -- for home module ModDetails
112 -> PersistentCompilerState -- IN: persistent compiler state
115 hscMain ghci_mode dflags source_unchanged location maybe_old_iface hst hit pcs
117 showPass dflags ("Checking old interface for hs = "
118 ++ show (ml_hs_file location)
119 ++ ", hspp = " ++ show (ml_hspp_file location));
121 (pcs_ch, errs_found, (recomp_reqd, maybe_checked_iface))
122 <- checkOldIface ghci_mode dflags hit hst pcs
123 (unJust "hscMain" (ml_hi_file location))
124 source_unchanged maybe_old_iface;
127 return (HscFail pcs_ch)
130 let no_old_iface = not (isJust maybe_checked_iface)
131 what_next | recomp_reqd || no_old_iface = hscRecomp
132 | otherwise = hscNoRecomp
134 what_next ghci_mode dflags location maybe_checked_iface
139 -- we definitely expect to have the old interface available
140 hscNoRecomp ghci_mode dflags location (Just old_iface) hst hit pcs_ch
141 | ghci_mode == OneShot
143 hPutStrLn stderr "compilation IS NOT required";
144 let { bomb = panic "hscNoRecomp:OneShot" };
145 return (HscNoRecomp pcs_ch bomb bomb)
149 hPutStr stderr "compilation IS NOT required";
150 when (verbosity dflags /= 1) $ hPutStrLn stderr "";
153 (pcs_cl, closure_errs, cl_hs_decls)
154 <- closeIfaceDecls dflags hit hst pcs_ch old_iface ;
156 return (HscFail pcs_cl)
160 maybe_tc_result <- typecheckModule dflags pcs_cl hst
161 old_iface alwaysQualify cl_hs_decls;
162 case maybe_tc_result of {
163 Nothing -> return (HscFail pcs_cl);
164 Just (pcs_tc, tc_result) -> do {
166 let env_tc = tc_env tc_result
167 local_rules = tc_rules tc_result
169 -- create a new details from the closed, typechecked, old iface
170 let new_details = mkModDetailsFromIface env_tc local_rules
172 return (HscNoRecomp pcs_tc new_details old_iface)
176 hscRecomp ghci_mode dflags location maybe_checked_iface hst hit pcs_ch
178 ; when (verbosity dflags >= 1) $
179 hPutStr stderr "compilation IS required";
180 -- mode -v1 tries to keep everything on one line
181 when (verbosity dflags > 1) $
184 -- what target are we shooting for?
185 ; let toInterp = dopt_HscLang dflags == HscInterpreted
190 ; maybe_parsed <- myParseModule dflags
191 (unJust "hscRecomp:hspp" (ml_hspp_file location))
192 ; case maybe_parsed of {
193 Nothing -> return (HscFail pcs_ch);
194 Just rdr_module -> do {
195 ; let this_mod = mkHomeModule (hsModuleName rdr_module)
200 ; (pcs_rn, maybe_rn_result)
201 <- renameModule dflags hit hst pcs_ch this_mod rdr_module
202 ; case maybe_rn_result of {
203 Nothing -> return (HscFail pcs_rn);
204 Just (print_unqualified, (is_exported, new_iface, rn_hs_decls)) -> do {
209 ; maybe_tc_result <- typecheckModule dflags pcs_rn hst new_iface
210 print_unqualified rn_hs_decls
211 ; case maybe_tc_result of {
212 Nothing -> return (HscFail pcs_rn);
213 Just (pcs_tc, tc_result) -> do {
215 ; let env_tc = tc_env tc_result
220 ; (ds_binds, ds_rules, foreign_stuff)
221 <- deSugar dflags pcs_tc hst this_mod print_unqualified tc_result
224 -- SIMPLIFY, TIDY-CORE
226 -- We grab the the unfoldings at this point.
227 ; (pcs_simpl, tidy_binds, orphan_rules)
228 <- simplThenTidy dflags pcs_tc hst this_mod is_exported ds_binds ds_rules
231 -- BUILD THE NEW ModDetails AND ModIface
233 ; let new_details = mkModDetails env_tc tidy_binds orphan_rules
234 ; final_iface <- mkFinalIface ghci_mode dflags location
235 maybe_checked_iface new_iface new_details
240 ; (stg_binds, cost_centre_info)
241 <- myCoreToStg dflags this_mod tidy_binds
244 -- COMPLETE CODE GENERATION
246 ; (maybe_stub_h_filename, maybe_stub_c_filename, maybe_ibinds)
247 <- restOfCodeGeneration dflags toInterp this_mod
248 (map ideclName (hsModuleImports rdr_module))
249 cost_centre_info foreign_stuff env_tc stg_binds tidy_binds
250 hit (pcs_PIT pcs_simpl)
252 -- and the answer is ...
253 ; return (HscRecomp pcs_simpl new_details final_iface
254 maybe_stub_h_filename maybe_stub_c_filename
260 mkFinalIface ghci_mode dflags location maybe_old_iface new_iface new_details
261 = case completeIface maybe_old_iface new_iface new_details of
262 (new_iface, Nothing) -- no change in the interfacfe
263 -> do when (dopt Opt_D_dump_hi_diffs dflags)
264 (printDump (text "INTERFACE UNCHANGED"))
265 dumpIfSet_dyn dflags Opt_D_dump_hi
266 "UNCHANGED FINAL INTERFACE" (pprIface new_iface)
268 (new_iface, Just sdoc_diffs)
269 -> do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "INTERFACE HAS CHANGED"
271 dumpIfSet_dyn dflags Opt_D_dump_hi "NEW FINAL INTERFACE"
273 -- Write the interface file
274 when (ghci_mode /= Interactive)
275 (writeIface (unJust "hscRecomp:hi" (ml_hi_file location))
280 myParseModule dflags src_filename
281 = do -------------------------- Parser ----------------
282 showPass dflags "Parser"
285 buf <- hGetStringBuffer True{-expand tabs-} src_filename
287 let glaexts | dopt Opt_GlasgowExts dflags = 1#
290 case parse buf PState{ bol = 0#, atbol = 1#,
291 context = [], glasgow_exts = glaexts,
292 loc = mkSrcLoc (_PK_ src_filename) 1 } of {
294 PFailed err -> do { hPutStrLn stderr (showSDoc err);
297 POk _ (PModule rdr_module@(HsModule mod_name _ _ _ _ _ _)) -> do {
299 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ;
301 dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics"
302 (ppSourceStats False rdr_module) ;
304 return (Just rdr_module)
308 simplThenTidy dflags pcs hst this_mod is_exported binds rules
309 = do -- Do main Core-language transformations ---------
311 (simplified, orphan_rules)
312 <- core2core dflags pcs hst is_exported binds rules
314 -- Do saturation and convert to A-normal form
315 -- NOTE: future passes cannot transform the syntax, only annotate it
316 saturated <- coreSatPgm dflags simplified
318 -- Do the final tidy-up
319 (pcs', tidy_binds, tidy_orphan_rules)
320 <- tidyCorePgm dflags this_mod pcs saturated orphan_rules
322 return (pcs', tidy_binds, tidy_orphan_rules)
325 restOfCodeGeneration dflags toInterp this_mod imported_module_names cost_centre_info
326 foreign_stuff env_tc stg_binds tidy_binds
327 hit pit -- these last two for mapping ModNames to Modules
329 = do (ibinds,itbl_env)
330 <- stgBindsToInterpSyn dflags (map fst stg_binds)
331 local_tycons local_classes
332 return (Nothing, Nothing, Just (ibinds,itbl_env))
335 = do -------------------------- Code generation -------------------------------
337 abstractC <- codeGen dflags this_mod imported_modules
338 cost_centre_info fe_binders
339 local_tycons stg_binds
341 -------------------------- Code output -------------------------------
342 -- _scc_ "CodeOutput"
343 (maybe_stub_h_name, maybe_stub_c_name)
344 <- codeOutput dflags this_mod local_tycons
346 c_code h_code abstractC
348 return (maybe_stub_h_name, maybe_stub_c_name, Nothing)
350 local_tycons = typeEnvTyCons env_tc
351 local_classes = typeEnvClasses env_tc
352 imported_modules = map mod_name_to_Module imported_module_names
353 (h_code,c_code,fe_binders) = foreign_stuff
355 mod_name_to_Module :: ModuleName -> Module
356 mod_name_to_Module nm
357 = let str_mi = case lookupModuleEnvByName hit nm of
359 Nothing -> case lookupModuleEnvByName pit nm of
363 barf nm = pprPanic "mod_name_to_Module: no hst or pst mapping for"
367 myCoreToStg dflags this_mod tidy_binds
369 () <- coreBindsSize tidy_binds `seq` return ()
370 -- TEMP: the above call zaps some space usage allocated by the
371 -- simplifier, which for reasons I don't understand, persists
372 -- thoroughout code generation
374 --let bcos = byteCodeGen tidy_binds
375 --putStrLn (showSDoc (vcat (map ppr bcos)))
378 stg_binds <- coreToStg dflags this_mod tidy_binds
381 (stg_binds2, cost_centre_info) <- stg2stg dflags this_mod stg_binds
383 return (stg_binds2, cost_centre_info)
387 %************************************************************************
389 \subsection{Compiling an expression}
391 %************************************************************************
399 -> PersistentCompilerState -- IN: persistent compiler state
400 -> Module -- Context for compiling
401 -> String -- The expression
402 -> IO ( PersistentCompilerState,
403 Maybe (UnlinkedIExpr, PrintUnqualified, Type) )
405 hscExpr dflags hst hit pcs0 this_module expr
407 maybe_parsed <- hscParseExpr dflags expr;
409 Nothing -> return (pcs0, Nothing)
410 Just parsed_expr -> do {
413 (pcs1, maybe_renamed_expr) <-
414 renameExpr dflags hit hst pcs0 this_module parsed_expr;
415 case maybe_renamed_expr of
416 Nothing -> return (pcs1, Nothing)
417 Just (print_unqual, rn_expr) -> do {
421 <- typecheckExpr dflags pcs1 hst print_unqual this_module rn_expr;
422 case maybe_tc_return of {
423 Nothing -> return (pcs1, Nothing);
424 Just (pcs2, tc_expr, ty) -> do
426 -- if it isn't an IO-typed expression,
427 -- wrap "print" around it & recompile...
428 let { is_IO_type = case splitTyConApp_maybe ty of {
429 Just (tycon, _) -> getUnique tycon == ioTyConKey;
434 then do (new_pcs, maybe_stuff)
435 <- hscExpr dflags hst hit pcs2 this_module
436 ("print (" ++ expr ++ ")")
438 Nothing -> return (new_pcs, maybe_stuff)
440 return (new_pcs, Just (expr, print_unqual, ty))
444 ds_expr <- deSugarExpr dflags pcs2 hst this_module
445 print_unqual tc_expr;
448 simpl_expr <- simplifyExpr dflags pcs2 hst ds_expr;
451 sat_expr <- coreSatExpr dflags simpl_expr;
454 let stg_expr = coreExprToStg sat_expr;
456 -- ToDo: need to do SRTs?
458 -- Convert to InterpSyn
459 unlinked_iexpr <- stgExprToInterpSyn dflags stg_expr;
461 return (pcs2, Just (unlinked_iexpr, print_unqual, ty));
464 hscParseExpr :: DynFlags -> String -> IO (Maybe RdrNameHsExpr)
465 hscParseExpr dflags str
466 = do -------------------------- Parser ----------------
467 showPass dflags "Parser"
470 buf <- stringToStringBuffer ("__expr " ++ str)
472 -- glaexts is True for now (because of the daft __expr at the front
475 --let glaexts | dopt Opt_GlasgowExts dflags = 1#
478 case parse buf PState{ bol = 0#, atbol = 1#,
479 context = [], glasgow_exts = glaexts,
480 loc = mkSrcLoc SLIT("<no file>") 0 } of {
482 PFailed err -> do { freeStringBuffer buf;
483 hPutStrLn stderr (showSDoc err);
486 POk _ (PExpr rdr_expr) -> do {
488 --ToDo: can't free the string buffer until we've finished this
489 -- compilation sweep and all the identifiers have gone away.
490 --freeStringBuffer buf;
491 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_expr);
492 return (Just rdr_expr)
497 %************************************************************************
499 \subsection{Initial persistent state}
501 %************************************************************************
504 initPersistentCompilerState :: IO PersistentCompilerState
505 initPersistentCompilerState
506 = do prs <- initPersistentRenamerState
508 PCS { pcs_PIT = emptyIfaceTable,
509 pcs_PTE = wiredInThingEnv,
510 pcs_insts = emptyInstEnv,
511 pcs_rules = emptyRuleBase,
516 initPersistentRenamerState :: IO PersistentRenamerState
517 = do us <- mkSplitUniqSupply 'r'
519 PRS { prsOrig = NameSupply { nsUniqs = us,
520 nsNames = initOrigNames,
522 prsDecls = (emptyNameEnv, 0),
523 prsInsts = (emptyBag, 0),
524 prsRules = (emptyBag, 0)
528 initOrigNames :: FiniteMap (ModuleName,OccName) Name
530 = grab knownKeyNames `plusFM` grab (map getName wiredInThings)
532 grab names = foldl add emptyFM names
534 = addToFM env (moduleName (nameModule name), nameOccName name) name
537 initRules :: PackageRuleBase
538 initRules = emptyRuleBase
540 foldl add emptyVarEnv builtinRules
543 = extendRuleBase env name rule