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 StringBuffer ( stringToStringBuffer, freeStringBuffer )
18 import Unique ( Uniquable(..) )
19 import Type ( splitTyConApp_maybe )
20 import PrelNames ( ioTyConKey )
21 import ByteCodeGen ( byteCodeGen )
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 )
44 import CoreToStg ( coreToStg, coreExprToStg )
45 import StgSyn ( collectFinalStgBinders )
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 OrigNameEnv(..), 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
218 -- DESUGAR, SIMPLIFY, TIDY-CORE
220 -- We grab the the unfoldings at this point.
221 ; simpl_result <- dsThenSimplThenTidy dflags pcs_tc hst this_mod
222 print_unqualified is_exported tc_result
223 ; let (pcs_simpl, tidy_binds, orphan_rules, foreign_stuff) = simpl_result
228 ; (stg_binds, cost_centre_info, top_level_ids)
229 <- myCoreToStg dflags this_mod tidy_binds
233 -- BUILD THE NEW ModDetails AND ModIface
235 ; let new_details = mkModDetails env_tc tidy_binds
236 top_level_ids orphan_rules
237 ; final_iface <- mkFinalIface ghci_mode dflags location
238 maybe_checked_iface new_iface new_details
241 -- COMPLETE CODE GENERATION
243 ; (maybe_stub_h_filename, maybe_stub_c_filename, maybe_ibinds)
244 <- restOfCodeGeneration dflags toInterp this_mod
245 (map ideclName (hsModuleImports rdr_module))
246 cost_centre_info foreign_stuff env_tc stg_binds tidy_binds
247 hit (pcs_PIT pcs_simpl)
249 -- and the answer is ...
250 ; return (HscRecomp pcs_simpl new_details final_iface
251 maybe_stub_h_filename maybe_stub_c_filename
257 mkFinalIface ghci_mode dflags location maybe_old_iface new_iface new_details
258 = case completeIface maybe_old_iface new_iface new_details of
259 (new_iface, Nothing) -- no change in the interfacfe
260 -> do when (dopt Opt_D_dump_hi_diffs dflags)
261 (printDump (text "INTERFACE UNCHANGED"))
262 dumpIfSet_dyn dflags Opt_D_dump_hi
263 "UNCHANGED FINAL INTERFACE" (pprIface new_iface)
265 (new_iface, Just sdoc_diffs)
266 -> do dumpIfSet_dyn dflags Opt_D_dump_hi_diffs "INTERFACE HAS CHANGED"
268 dumpIfSet_dyn dflags Opt_D_dump_hi "NEW FINAL INTERFACE"
270 -- Write the interface file
271 when (ghci_mode /= Interactive)
272 (writeIface (unJust "hscRecomp:hi" (ml_hi_file location))
277 myParseModule dflags src_filename
278 = do -------------------------- Parser ----------------
279 showPass dflags "Parser"
282 buf <- hGetStringBuffer True{-expand tabs-} src_filename
284 let glaexts | dopt Opt_GlasgowExts dflags = 1#
287 case parse buf PState{ bol = 0#, atbol = 1#,
288 context = [], glasgow_exts = glaexts,
289 loc = mkSrcLoc (_PK_ src_filename) 1 } of {
291 PFailed err -> do { hPutStrLn stderr (showSDoc err);
294 POk _ (PModule rdr_module@(HsModule mod_name _ _ _ _ _ _)) -> do {
296 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_module) ;
298 dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics"
299 (ppSourceStats False rdr_module) ;
301 return (Just rdr_module)
305 restOfCodeGeneration dflags toInterp this_mod imported_module_names cost_centre_info
306 foreign_stuff env_tc stg_binds tidy_binds
307 hit pit -- these last two for mapping ModNames to Modules
309 = do (ibinds,itbl_env)
310 <- stgBindsToInterpSyn dflags (map fst stg_binds)
311 local_tycons local_classes
312 return (Nothing, Nothing, Just (ibinds,itbl_env))
315 = do -------------------------- Code generation -------------------------------
317 abstractC <- codeGen dflags this_mod imported_modules
318 cost_centre_info fe_binders
319 local_tycons stg_binds
321 -------------------------- Code output -------------------------------
322 -- _scc_ "CodeOutput"
323 (maybe_stub_h_name, maybe_stub_c_name)
324 <- codeOutput dflags this_mod local_tycons
326 c_code h_code abstractC
328 return (maybe_stub_h_name, maybe_stub_c_name, Nothing)
330 local_tycons = typeEnvTyCons env_tc
331 local_classes = typeEnvClasses env_tc
332 imported_modules = map mod_name_to_Module imported_module_names
333 (fe_binders,h_code,c_code) = foreign_stuff
335 mod_name_to_Module :: ModuleName -> Module
336 mod_name_to_Module nm
337 = let str_mi = case lookupModuleEnvByName hit nm of
339 Nothing -> case lookupModuleEnvByName pit nm of
343 barf nm = pprPanic "mod_name_to_Module: no hst or pst mapping for"
347 dsThenSimplThenTidy dflags pcs hst this_mod print_unqual is_exported tc_result
348 = do ------------------ Desugaring ---------------------------------
350 (desugared, rules, h_code, c_code, fe_binders)
351 <- deSugar dflags pcs hst this_mod print_unqual tc_result
353 ------------------ Main Core-language transformations ---------
355 (simplified, orphan_rules)
356 <- core2core dflags pcs hst is_exported desugared rules
358 -- Do saturation and convert to A-normal form
359 -- NOTE: future passes cannot transform the syntax, only annotate it
360 saturated <- coreSatPgm dflags simplified
362 -- Do the final tidy-up
363 (pcs', tidy_binds, tidy_orphan_rules)
364 <- tidyCorePgm dflags this_mod pcs saturated orphan_rules
366 return (pcs', tidy_binds, tidy_orphan_rules, (fe_binders,h_code,c_code))
369 myCoreToStg dflags this_mod tidy_binds
371 () <- coreBindsSize tidy_binds `seq` return ()
372 -- TEMP: the above call zaps some space usage allocated by the
373 -- simplifier, which for reasons I don't understand, persists
374 -- thoroughout code generation
376 --let bcos = byteCodeGen tidy_binds
377 --putStrLn (showSDoc (vcat (map ppr bcos)))
380 stg_binds <- coreToStg dflags this_mod tidy_binds
383 (stg_binds2, cost_centre_info) <- stg2stg dflags this_mod stg_binds
384 let final_ids = collectFinalStgBinders (map fst stg_binds2)
386 return (stg_binds2, cost_centre_info, final_ids)
390 %************************************************************************
392 \subsection{Compiling an expression}
394 %************************************************************************
398 hscExpr dflags hst hit pcs this_module expr
399 = panic "hscExpr: non-interactive build"
400 hscTypeExpr dflags hst hit pcs0 this_module expr
401 = panic "hscTypeExpr: non-interactive build"
408 -> PersistentCompilerState -- IN: persistent compiler state
409 -> Module -- Context for compiling
410 -> String -- The expression
411 -> IO ( PersistentCompilerState,
412 Maybe (UnlinkedIExpr, PrintUnqualified, Type) )
414 hscExpr dflags hst hit pcs0 this_module expr
416 maybe_parsed <- hscParseExpr dflags expr;
418 Nothing -> return (pcs0, Nothing)
419 Just parsed_expr -> do {
422 (pcs1, maybe_renamed_expr) <-
423 renameExpr dflags hit hst pcs0 this_module parsed_expr;
424 case maybe_renamed_expr of
425 Nothing -> return (pcs1, Nothing)
426 Just (print_unqual, rn_expr) -> do {
430 <- typecheckExpr dflags pcs1 hst print_unqual this_module rn_expr;
431 case maybe_tc_return of {
432 Nothing -> return (pcs1, Nothing);
433 Just (pcs2, tc_expr, ty) -> do
435 -- if it isn't an IO-typed expression,
436 -- wrap "print" around it & recompile...
437 let { is_IO_type = case splitTyConApp_maybe ty of {
438 Just (tycon, _) -> getUnique tycon == ioTyConKey;
443 then do (new_pcs, maybe_stuff)
444 <- hscExpr dflags hst hit pcs2 this_module
445 ("print (" ++ expr ++ ")")
447 Nothing -> return (new_pcs, maybe_stuff)
449 return (new_pcs, Just (expr, print_unqual, ty))
453 ds_expr <- deSugarExpr dflags pcs2 hst this_module
454 print_unqual tc_expr;
457 simpl_expr <- simplifyExpr dflags pcs2 hst ds_expr;
460 sat_expr <- coreSatExpr dflags simpl_expr;
463 let stg_expr = coreExprToStg sat_expr;
465 -- ToDo: need to do SRTs?
467 -- Convert to InterpSyn
468 unlinked_iexpr <- stgExprToInterpSyn dflags stg_expr;
470 return (pcs2, Just (unlinked_iexpr, print_unqual, ty));
473 hscParseExpr :: DynFlags -> String -> IO (Maybe RdrNameHsExpr)
474 hscParseExpr dflags str
475 = do -------------------------- Parser ----------------
476 showPass dflags "Parser"
479 buf <- stringToStringBuffer ("__expr " ++ str)
481 -- glaexts is True for now (because of the daft __expr at the front
484 --let glaexts | dopt Opt_GlasgowExts dflags = 1#
487 case parse buf PState{ bol = 0#, atbol = 1#,
488 context = [], glasgow_exts = glaexts,
489 loc = mkSrcLoc SLIT("<no file>") 0 } of {
491 PFailed err -> do { freeStringBuffer buf;
492 hPutStrLn stderr (showSDoc err);
495 POk _ (PExpr rdr_expr) -> do {
497 --ToDo: can't free the string buffer until we've finished this
498 -- compilation sweep and all the identifiers have gone away.
499 --freeStringBuffer buf;
500 dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_expr);
501 return (Just rdr_expr)
506 %************************************************************************
508 \subsection{Initial persistent state}
510 %************************************************************************
513 initPersistentCompilerState :: IO PersistentCompilerState
514 initPersistentCompilerState
515 = do prs <- initPersistentRenamerState
517 PCS { pcs_PIT = emptyIfaceTable,
518 pcs_PTE = wiredInThingEnv,
519 pcs_insts = emptyInstEnv,
520 pcs_rules = emptyRuleBase,
525 initPersistentRenamerState :: IO PersistentRenamerState
526 = do ns <- mkSplitUniqSupply 'r'
528 PRS { prsOrig = Orig { origNames = initOrigNames,
529 origIParam = emptyFM },
530 prsDecls = (emptyNameEnv, 0),
531 prsInsts = (emptyBag, 0),
532 prsRules = (emptyBag, 0),
537 initOrigNames :: FiniteMap (ModuleName,OccName) Name
539 = grab knownKeyNames `plusFM` grab (map getName wiredInThings)
541 grab names = foldl add emptyFM names
543 = addToFM env (moduleName (nameModule name), nameOccName name) name
546 initRules :: PackageRuleBase
547 initRules = emptyRuleBase
549 foldl add emptyVarEnv builtinRules
552 = extendRuleBase env name rule