X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fiface%2FLoadIface.lhs;h=1ebbd39b75b6c389df3b0941a81507eee71455e2;hb=262c142b90c94ca1aa577c950a6ceae1f255e2d6;hp=00e9e7a26f86b915ebf1a6dbb16701c86cabc941;hpb=7fa861d23122d4d6a3053c09b5c636bad0478ad3;p=ghc-hetmet.git

diff --git a/compiler/iface/LoadIface.lhs b/compiler/iface/LoadIface.lhs
index 00e9e7a..1ebbd39 100644
--- a/compiler/iface/LoadIface.lhs
+++ b/compiler/iface/LoadIface.lhs
@@ -19,7 +19,7 @@ module LoadIface (
 #include "HsVersions.h"
 
 import {-# SOURCE #-}	TcIface( tcIfaceDecl, tcIfaceRules, tcIfaceInst, 
-				 tcIfaceFamInst )
+				 tcIfaceFamInst, tcIfaceVectInfo )
 
 import DynFlags
 import IfaceSyn
@@ -38,7 +38,6 @@ import InstEnv
 import FamInstEnv
 import Name
 import NameEnv
-import NameSet
 import MkId
 import Module
 import OccName
@@ -52,7 +51,6 @@ import Outputable
 import BinIface
 import Panic
 
-import Control.Monad (when)
 import Data.List
 import Data.Maybe
 import Data.IORef
@@ -120,6 +118,7 @@ loadInterfaceForName doc name
 
 -- | An 'IfM' function to load the home interface for a wired-in thing,
 -- so that we're sure that we see its instance declarations and rules
+-- See Note [Loading instances]
 loadWiredInHomeIface :: Name -> IfM lcl ()
 loadWiredInHomeIface name
   = ASSERT( isWiredInName name )
@@ -136,6 +135,27 @@ loadSysInterface doc mod_name
 	    Succeeded iface -> return iface }
 \end{code}
 
+Note [Loading instances]
+~~~~~~~~~~~~~~~~~~~~~~~~
+We need to make sure that we have at least *read* the interface files
+for any module with an instance decl or RULE that we might want.  
+
+* If the instance decl is an orphan, we have a whole separate mechanism
+  (loadOprhanModules)
+
+* If the instance decl not an orphan, then the act of looking at the
+  TyCon or Class will force in the defining module for the
+  TyCon/Class, and hence the instance decl
+
+* BUT, if the TyCon is a wired-in TyCon, we don't really need its interface;
+  but we must make sure we read its interface in case it has instances or
+  rules.  That is what LoadIface.loadWiredInHomeInterface does.  It's called
+  from TcIface.{tcImportDecl, checkWiredInTyCon, ifCHeckWiredInThing}
+
+All of this is done by the type checker. The renamer plays no role.
+(It used to, but no longer.)
+
+
 
 %*********************************************************
 %*							*
@@ -239,6 +259,8 @@ loadInterface doc_str mod from
 	; new_eps_insts     <- mapM tcIfaceInst (mi_insts iface)
 	; new_eps_fam_insts <- mapM tcIfaceFamInst (mi_fam_insts iface)
 	; new_eps_rules     <- tcIfaceRules ignore_prags (mi_rules iface)
+        ; new_eps_vect_info <- tcIfaceVectInfo mod (mkNameEnv new_eps_decls) 
+                                               (mi_vect_info iface)
 
 	; let {	final_iface = iface {	
 			        mi_decls     = panic "No mi_decls in PIT",
@@ -246,11 +268,6 @@ loadInterface doc_str mod from
 				mi_fam_insts = panic "No mi_fam_insts in PIT",
 				mi_rules     = panic "No mi_rules in PIT"
                               }
-              ; new_eps_vect_info =
-                  VectInfo {
-                    vectInfoCCVar = mkNameSet 
-                                     (ifaceVectInfoCCVar . mi_vect_info $ iface)
-                  }     
                }
 
 	; updateEps_  $ \ eps -> 
@@ -372,8 +389,7 @@ loadDecl ignore_prags mod (_version, decl)
 	--	* location
 	-- imported name, to fix the module correctly in the cache
     mk_new_bndr mod occ 
-	= newGlobalBinder mod occ 
-			  (importedSrcLoc (showSDoc (ppr (moduleName mod))))
+	= newGlobalBinder mod occ (importedSrcSpan (moduleNameFS (moduleName mod)))
 			-- ToDo: qualify with the package name if necessary
 
     doc = ptext SLIT("Declaration for") <+> ppr (ifName decl)
@@ -587,6 +603,7 @@ pprModIface iface
 	, vcat (map ppr (mi_insts iface))
 	, vcat (map ppr (mi_fam_insts iface))
 	, vcat (map ppr (mi_rules iface))
+        , pprVectInfo (mi_vect_info iface)
 	, pprDeprecs (mi_deprecs iface)
 	]
   where
@@ -659,6 +676,17 @@ pprFixities fixes = ptext SLIT("fixities") <+> pprWithCommas pprFix fixes
 		  where
 		    pprFix (occ,fix) = ppr fix <+> ppr occ 
 
+pprVectInfo :: IfaceVectInfo -> SDoc
+pprVectInfo (IfaceVectInfo { ifaceVectInfoCCVar        = vars
+                           , ifaceVectInfoCCTyCon      = tycons
+                           , ifaceVectInfoCCTyConReuse = tyconsReuse
+                           }) = 
+  vcat 
+  [ ptext SLIT("CC'ed variables:") <+> hsep (map ppr vars)
+  , ptext SLIT("CC'ed tycons:") <+> hsep (map ppr tycons)
+  , ptext SLIT("CC reused tycons:") <+> hsep (map ppr tyconsReuse)
+  ]
+
 pprDeprecs NoDeprecs	    = empty
 pprDeprecs (DeprecAll txt)  = ptext SLIT("Deprecate all") <+> doubleQuotes (ftext txt)
 pprDeprecs (DeprecSome prs) = ptext SLIT("Deprecate") <+> vcat (map pprDeprec prs)