From bb118b7356439a930be13962ced5f36aab9f74bf Mon Sep 17 00:00:00 2001
From: Fumitoshi UKAI <ukai@debian.or.jp>
Date: Wed, 10 Jul 2002 14:21:11 +0000
Subject: import gc6.1alpha5

---
 gc/reclaim.c | 48 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 34 insertions(+), 14 deletions(-)

(limited to 'gc/reclaim.c')

diff --git a/gc/reclaim.c b/gc/reclaim.c
index 48db1e2..0418e9d 100644
--- a/gc/reclaim.c
+++ b/gc/reclaim.c
@@ -631,47 +631,41 @@ COUNT_DECL
     ptr_t result = list;
 
     GC_ASSERT(GC_find_header((ptr_t)hbp) == hhdr);
+    GC_remove_protection(hbp, 1, (hhdr)->hb_descr == 0 /* Pointer-free? */);
     if (init) {
       switch(sz) {
 #      if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
         case 1:
 	    /* We now issue the hint even if GC_nearly_full returned	*/
 	    /* DONT_KNOW.						*/
-	    GC_write_hint(hbp);
             result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
             break;
         case 2:
-	    GC_write_hint(hbp);
             result = GC_reclaim_clear2(hbp, hhdr, list COUNT_ARG);
             break;
         case 4:
-	    GC_write_hint(hbp);
             result = GC_reclaim_clear4(hbp, hhdr, list COUNT_ARG);
             break;
 #      endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
         default:
-	    GC_write_hint(hbp);
             result = GC_reclaim_clear(hbp, hhdr, sz, list COUNT_ARG);
             break;
       }
     } else {
+      GC_ASSERT((hhdr)->hb_descr == 0 /* Pointer-free block */);
       switch(sz) {
 #      if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
         case 1:
-	    GC_write_hint(hbp);
             result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
             break;
         case 2:
-	    GC_write_hint(hbp);
             result = GC_reclaim_uninit2(hbp, hhdr, list COUNT_ARG);
             break;
         case 4:
-	    GC_write_hint(hbp);
             result = GC_reclaim_uninit4(hbp, hhdr, list COUNT_ARG);
             break;
 #      endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
         default:
-	    GC_write_hint(hbp);
             result = GC_reclaim_uninit(hbp, hhdr, sz, list COUNT_ARG);
             break;
       }
@@ -867,6 +861,25 @@ void GC_print_block_list()
 
 #endif /* NO_DEBUGGING */
 
+/*
+ * Clear all obj_link pointers in the list of free objects *flp.
+ * Clear *flp.
+ * This must be done before dropping a list of free gcj-style objects,
+ * since may otherwise end up with dangling "descriptor" pointers.
+ * It may help for other pointer-containg objects.
+ */
+void GC_clear_fl_links(flp)
+ptr_t *flp;
+{
+    ptr_t next = *flp;
+
+    while (0 != next) {
+       *flp = 0;
+       flp = &(obj_link(next));
+       next = *flp;
+    }
+}
+
 /*
  * Perform GC_reclaim_block on the entire heap, after first clearing
  * small object free lists (if we are not just looking for leaks).
@@ -881,17 +894,24 @@ int report_if_found;		/* Abort if a GC_reclaimable object is found */
 #   endif
     /* Clear reclaim- and free-lists */
       for (kind = 0; kind < GC_n_kinds; kind++) {
-        register ptr_t *fop;
-        register ptr_t *lim;
-        register struct hblk ** rlp;
-        register struct hblk ** rlim;
-        register struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
+        ptr_t *fop;
+        ptr_t *lim;
+        struct hblk ** rlp;
+        struct hblk ** rlim;
+        struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
+	GC_bool should_clobber = (GC_obj_kinds[kind].ok_descriptor != 0);
         
         if (rlist == 0) continue;	/* This kind not used.	*/
         if (!report_if_found) {
             lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJSZ+1]);
 	    for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
-	      *fop = 0;
+	      if (*fop != 0) {
+		if (should_clobber) {
+		  GC_clear_fl_links(fop);
+		} else {
+	          *fop = 0;
+		}
+	      }
 	    }
 	} /* otherwise free list objects are marked, 	*/
 	  /* and its safe to leave them			*/
-- 
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