From e19ffca9c4f5192a8757bfb3f35e6a3907f29e76 Mon Sep 17 00:00:00 2001
From: sof <unknown>
Date: Tue, 29 Feb 2000 19:59:38 +0000
Subject: [PATCH] [project @ 2000-02-29 19:59:38 by sof] Added
 removeIndirections() and make use of it in
 lookupStableName() -- increases the possibilities of
 StableName sharing.

---
 ghc/rts/Stable.c |   31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/ghc/rts/Stable.c b/ghc/rts/Stable.c
index 2d280a4..d0d64dd 100644
--- a/ghc/rts/Stable.c
+++ b/ghc/rts/Stable.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: Stable.c,v 1.9 1999/10/26 17:15:39 sewardj Exp $
+ * $Id: Stable.c,v 1.10 2000/02/29 19:59:38 sof Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -152,6 +152,27 @@ initStablePtrTable(void)
   SPT_size = 0;
 }
 
+/*
+ * get at the real stuff...remove indirections.
+ *
+ * ToDo: move to a better home.
+ */
+static
+StgClosure*
+removeIndirections(StgClosure* p)
+{
+  StgClosure* q = p;
+
+  while (q->header.info->type == IND ||
+         q->header.info->type == IND_STATIC ||
+         q->header.info->type == IND_OLDGEN ||
+         q->header.info->type == IND_PERM ||
+         q->header.info->type == IND_OLDGEN_PERM ) {
+      q = ((StgInd *)q)->indirectee;
+  }
+  return q;
+}
+
 StgWord
 lookupStableName(StgPtr p)
 {
@@ -160,7 +181,13 @@ lookupStableName(StgPtr p)
   if (stable_ptr_free == NULL) {
     enlargeStablePtrTable();
   }
-    
+
+  /* removing indirections increases the likelihood
+   * of finding a match in the stable name
+   * hash table.
+   */
+  p = (StgPtr)removeIndirections((StgClosure*)p);
+
   (void *)sn = lookupHashTable(addrToStableHash,(W_)p);
   
   if (sn != 0) {
-- 
1.7.10.4