X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=compiler%2Fiface%2FLoadIface.lhs;h=6835fe620fcc15f64cb1c299a83dd8877de02131;hb=10c6e54de5f6b4ebd3183d8184941e1915edf6cf;hp=8ca7b41ac5dd23d41c4f137f7078d2ca18047562;hpb=686d87447e2186e2aa55e1a925f0a3a8e94872f5;p=ghc-hetmet.git

diff --git a/compiler/iface/LoadIface.lhs b/compiler/iface/LoadIface.lhs
index 8ca7b41..6835fe6 100644
--- a/compiler/iface/LoadIface.lhs
+++ b/compiler/iface/LoadIface.lhs
@@ -118,6 +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 )
@@ -134,6 +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.)
+
+
 
 %*********************************************************
 %*							*
@@ -655,14 +677,14 @@ pprFixities fixes = ptext SLIT("fixities") <+> pprWithCommas pprFix fixes
 		    pprFix (occ,fix) = ppr fix <+> ppr occ 
 
 pprVectInfo :: IfaceVectInfo -> SDoc
-pprVectInfo (IfaceVectInfo { ifaceVectInfoCCVar        = vars
-                           , ifaceVectInfoCCTyCon      = tycons
-                           , ifaceVectInfoCCTyConReuse = tyconsReuse
+pprVectInfo (IfaceVectInfo { ifaceVectInfoVar        = vars
+                           , ifaceVectInfoTyCon      = tycons
+                           , ifaceVectInfoTyConReuse = 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)
+  [ ptext SLIT("vectorised variables:") <+> hsep (map ppr vars)
+  , ptext SLIT("vectorised tycons:") <+> hsep (map ppr tycons)
+  , ptext SLIT("vectorised reused tycons:") <+> hsep (map ppr tyconsReuse)
   ]
 
 pprDeprecs NoDeprecs	    = empty