allow build settings to be overriden by adding mk/validate.mk

[ghc-hetmet.git] / compiler / iface / LoadIface.lhs

diff --git a/compiler/iface/LoadIface.lhs b/compiler/iface/LoadIface.lhs
index 1c8b410..1ebbd39 100644 (file)
--- a/compiler/iface/LoadIface.lhs
+++ b/compiler/iface/LoadIface.lhs
@@ -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.)
+
+
 
 %*********************************************************
 %*                                                     *
@@ -369,8 +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)
@@ -658,8 +677,15 @@ pprFixities fixes = ptext SLIT("fixities") <+> pprWithCommas pprFix fixes
                    pprFix (occ,fix) = ppr fix <+> ppr occ 
 
 pprVectInfo :: IfaceVectInfo -> SDoc
-pprVectInfo (IfaceVectInfo names) = 
-  ptext SLIT("Closured converted:") <+> hsep (map ppr names)
+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)