add Outputable instance for OccIfaceEq

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

diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index 33b18c4..b11c1e0 100644 (file)
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -423,7 +423,13 @@ mkIface_ hsc_env maybe_old_iface
        ; dumpIfSet_dyn dflags Opt_D_dump_hi "FINAL INTERFACE" 
                        (pprModIface new_iface)
 
-       ; return (new_iface, no_change_at_all) }
+                -- bug #1617: on reload we weren't updating the PrintUnqualified
+                -- correctly.  This stems from the fact that the interface had
+                -- not changed, so addVersionInfo returns the old ModIface
+                -- with the old GlobalRdrEnv (mi_globals).
+        ; let final_iface = new_iface{ mi_globals = Just rdr_env }
+
+       ; return (final_iface, no_change_at_all) }
   where
      r1 `le_rule`     r2 = ifRuleName      r1    <=    ifRuleName      r2
      i1 `le_inst`     i2 = ifDFun          i1 `le_occ` ifDFun          i2  
@@ -698,17 +704,23 @@ computeChangedOccs ver_fn this_module old_usages eq_info
     -- return True if an external name has changed
     name_changed :: Name -> Bool
     name_changed nm
-        | Just ents <- lookupUFM usg_modmap (moduleName mod) 
-        = case lookupUFM ents parent_occ of
-                Nothing -> pprPanic "computeChangedOccs" (ppr nm)
-                Just v  -> v < new_version
+        | Just ents <- lookupUFM usg_modmap (moduleName mod),
+          Just v    <- lookupUFM ents parent_occ
+        = v < new_version
+        | modulePackageId mod == this_pkg
+        = WARN(True, ptext SLIT("computeChangedOccs") <+> ppr nm) True
+        -- should really be a panic, see #1959.  The problem is that the usages doesn't
+        -- contain all the names that might be referred to by unfoldings.  So as a
+        -- conservative workaround we just assume these names have changed.
         | otherwise = False -- must be in another package
       where
          mod = nameModule nm
          (parent_occ, new_version) = ver_fn nm
 
+    this_pkg = modulePackageId this_module
+
     -- Turn the usages from the old ModIface into a mapping
-    usg_modmap = listToUFM [ (usg_mod usg, listToUFM (usg_entities usg))
+    usg_modmap = listToUFM [ (usg_name usg, listToUFM (usg_entities usg))
                            | usg <- old_usages ]
 
     get_local_eq_info :: GenIfaceEq NameSet -> GenIfaceEq OccSet
@@ -743,6 +755,11 @@ computeChangedOccs ver_fn this_module old_usages eq_info
 
 type OccIfaceEq = GenIfaceEq OccSet
 
+instance Outputable OccIfaceEq where
+  ppr Equal          = ptext SLIT("Equal")
+  ppr NotEqual       = ptext SLIT("NotEqual")
+  ppr (EqBut occset) = ptext SLIT("EqBut") <+> ppr (occSetElts occset)
+
 changedWrt :: OccSet -> OccIfaceEq -> Bool
 changedWrt so_far Equal        = False
 changedWrt so_far NotEqual     = True