X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FdeSugar%2FDesugar.lhs;h=2cb65c9c53b84ef96ac13c54aa18d67329ffa6bb;hb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;hp=40e3bcc1fcd40cbb905e86f37c865f84a17fb64b;hpb=1fb1ab5d53a09607e7f6d2450806760688396387;p=ghc-hetmet.git

diff --git a/ghc/compiler/deSugar/Desugar.lhs b/ghc/compiler/deSugar/Desugar.lhs
index 40e3bcc..2cb65c9 100644
--- a/ghc/compiler/deSugar/Desugar.lhs
+++ b/ghc/compiler/deSugar/Desugar.lhs
@@ -1,35 +1,31 @@
 %
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
 \section[Desugar]{@deSugar@: the main function}
 
 \begin{code}
-#include "HsVersions.h"
-
-module Desugar ( deSugar, DsMatchContext, pprDsWarnings, 
-                 DsWarnFlavour -- removed when compiling with 1.4
-	       ) where
+module Desugar ( deSugar ) where
 
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
 
-import HsSyn		( HsBinds, HsExpr )
-import TcHsSyn		( SYN_IE(TypecheckedHsBinds), SYN_IE(TypecheckedHsExpr) )
+import CmdLineOpts	( opt_D_dump_ds )
+import HsSyn		( MonoBinds )
+import TcHsSyn		( TypecheckedMonoBinds, TypecheckedForeignDecl )
 import CoreSyn
-import Name             ( isExported )
 import DsMonad
-import DsBinds		( dsBinds, dsInstBinds )
+import DsBinds		( dsMonoBinds )
+import DsForeign	( dsForeigns )
 import DsUtils
-
-import Bag		( unionBags )
-import CmdLineOpts	( opt_DoCoreLinting, opt_AutoSccsOnAllToplevs, 
-		          opt_AutoSccsOnExportedToplevs, opt_SccGroup
-			   )
-import CostCentre       ( IsCafCC(..), mkAutoCC )
-import CoreLift		( liftCoreBindings )
-import CoreLint		( lintCoreBindings )
-import Id		( nullIdEnv, mkIdEnv, idType, SYN_IE(DictVar), GenId )
-import PprStyle		( PprStyle(..) )
-import UniqSupply	( splitUniqSupply )
+import DsExpr		()	-- Forces DsExpr to be compiled; DsBinds only
+				-- depends on DsExpr.hi-boot.
+
+import Bag		( isEmptyBag )
+import BasicTypes       ( Module )
+import CmdLineOpts	( opt_SccGroup, opt_SccProfilingOn )
+import CoreLint		( beginPass, endPass )
+import ErrUtils		( doIfSet )
+import Outputable
+import UniqSupply	( splitUniqSupply, UniqSupply )
 \end{code}
 
 The only trick here is to get the @DsMonad@ stuff off to a good
@@ -37,97 +33,38 @@ start.
 
 \begin{code}
 deSugar :: UniqSupply		-- name supply
-	-> FAST_STRING			-- module name
-
-	-> (TypecheckedHsBinds, -- input: recsel, class, instance, and value
-	    TypecheckedHsBinds, --   bindings; see "tcModule" (which produces
-	    TypecheckedHsBinds,	--   them)
-	    TypecheckedHsBinds,
-	    [(Id, TypecheckedHsExpr)])
--- ToDo: handling of const_inst thingies is certainly WRONG ***************************
-
-	-> ([CoreBinding],	-- output
-	    DsWarnings)	    -- Shadowing complaints
-
-deSugar us mod_name (recsel_binds, clas_binds, inst_binds, val_binds, const_inst_pairs)
-  = let
-	(us0, us0a) = splitUniqSupply us
-	(us1, us1a) = splitUniqSupply us0a
-	(us2, us2a) = splitUniqSupply us1a
-	(us3, us3a) = splitUniqSupply us2a
-	(us4, us5)  = splitUniqSupply us3a
-
-
-	module_and_group = (mod_name, grp_name)
-	grp_name  = case opt_SccGroup of
-		    	Just xx -> _PK_ xx
-		    	Nothing -> mod_name	-- default: module name
-
-	((core_const_prs, consts_pairs), shadows1)
-	    = initDs us0 nullIdEnv mod_name (dsInstBinds [] const_inst_pairs)
-
-	consts_env = mkIdEnv consts_pairs
-
-	(core_clas_binds, shadows2)
-			= initDs us1 consts_env mod_name (dsBinds clas_binds)
-	core_clas_prs	= pairsFromCoreBinds core_clas_binds
-
-	(core_inst_binds, shadows3)
-			= initDs us2 consts_env mod_name (dsBinds inst_binds)
-	core_inst_prs	= pairsFromCoreBinds core_inst_binds
-
-	(core_val_binds, shadows4)
-			= initDs us3 consts_env mod_name (dsBinds val_binds)
-	core_val_pairs	= map (addAutoScc module_and_group) (pairsFromCoreBinds core_val_binds)
-
-	(core_recsel_binds, shadows5)
-			= initDs us4 consts_env mod_name (dsBinds recsel_binds)
-	core_recsel_prs	= pairsFromCoreBinds core_recsel_binds
-
-    	final_binds
-	  = if (null core_clas_prs && null core_inst_prs
-	     && null core_recsel_prs {-???dont know???-} && null core_const_prs) then
-		-- we don't have to make the whole thing recursive
-		core_clas_binds ++ core_val_binds
-
-	    else -- gotta make it recursive (sigh)
-	       [Rec (core_clas_prs ++ core_inst_prs
-		  ++ core_const_prs ++ core_val_pairs ++ core_recsel_prs)]
-
-	lift_final_binds = liftCoreBindings us5 final_binds
-
-	really_final_binds = if opt_DoCoreLinting
-			     then lintCoreBindings PprDebug "Desugarer" False lift_final_binds
-			     else lift_final_binds
-
-	shadows = shadows1 `unionBags` shadows2 `unionBags`
-		  shadows3 `unionBags` shadows4 `unionBags` shadows5
-    in
-    (really_final_binds, shadows)
-\end{code}
-
-
-%************************************************************************
-%*									*
-\subsection[addAutoScc]{Adding automatic sccs}
-%*									*
-%************************************************************************
-
-\begin{code}
-addAutoScc :: (FAST_STRING, FAST_STRING)	-- Module and group
-	   -> (Id, CoreExpr)
-	   -> (Id,CoreExpr)
-
-addAutoScc (mod, grp) pair@(bndr, core_expr)
-  | worthSCC core_expr &&
-    (opt_AutoSccsOnAllToplevs ||
-     (isExported bndr && opt_AutoSccsOnExportedToplevs))
-  = (bndr, SCC (mkAutoCC bndr mod grp IsNotCafCC) core_expr)
-
-  | otherwise
-  = pair
+        -> GlobalValueEnv	-- value env
+	-> Module		-- module name
+	-> TypecheckedMonoBinds
+	-> [TypecheckedForeignDecl]
+	-> IO ([CoreBind], SDoc, SDoc) -- output
+
+deSugar us global_val_env mod_name all_binds fo_decls = do
+	beginPass "Desugar"
+	-- Do desugaring
+	let (core_prs, ds_warns) = initDs us1 global_val_env module_and_group 
+				            (dsMonoBinds opt_SccProfilingOn all_binds [])
+            ds_binds' = [Rec core_prs]
+
+    	    ((fi_binds, fe_binds, h_code, c_code), ds_warns2) = 
+	            initDs us3 global_val_env module_and_group (dsForeigns fo_decls)
+
+  	    ds_binds  = fi_binds ++ ds_binds' ++ fe_binds
+
+	 -- Display any warnings
+        doIfSet (not (isEmptyBag ds_warns))
+		(printErrs (pprDsWarnings ds_warns))
+
+	 -- Lint result if necessary
+        endPass "Desugar" opt_D_dump_ds ds_binds
+        return (ds_binds, h_code, c_code)
+  where
+    (us1, us2) = splitUniqSupply us
+    (us3, us4) = splitUniqSupply us2
+
+    module_and_group = (mod_name, grp_name)
+    grp_name  = case opt_SccGroup of
+	          Just xx -> _PK_ xx
+	    	  Nothing -> mod_name	-- default: module name
 
-worthSCC (SCC _ _) = False
-worthSCC (Con _ _) = False
-worthSCC core_expr = True
 \end{code}