From b1a749bacce901a0cad8abbbfc0addb482a8adfa Mon Sep 17 00:00:00 2001
From: tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 2 Oct 2001 14:31:47 +0000
Subject: 	* gcj/javaprims.h: Rebuilt class list. 	* boehm.cc
 (_Jv_GCRegisterDisappearingLink): New function. 
 (_Jv_GCCanReclaimSoftReference): New function. 	* include/jvm.h
 (_Jv_GCRegisterDisappearingLink): Declare. 
 (_Jv_GCCanReclaimSoftReference): Declare. 	* java/lang/ref/Reference.java
 (referent): Now a RawData. 	(create): Renamed from `created'.  Added
 object argument. 	(Reference): Don't initialize `referent' here. 	*
 Makefile.in: Rebuilt. 	* Makefile.am (nat_source_files): Added new file. 
 * java/lang/ref/natReference.cc: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45958 138bc75d-0d04-0410-961f-82ee72b054a4
---
 libjava/java/lang/ref/Reference.java | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

(limited to 'libjava/java/lang/ref/Reference.java')

diff --git a/libjava/java/lang/ref/Reference.java b/libjava/java/lang/ref/Reference.java
index 23490333b0d..5a6c66324b2 100644
--- a/libjava/java/lang/ref/Reference.java
+++ b/libjava/java/lang/ref/Reference.java
@@ -64,8 +64,21 @@ public abstract class Reference
   /**
    * The underlying object.  This field is handled in a special way by
    * the garbage collection.
+   * GCJ LOCAL:
+   * This is a RawData because it must be disguised from the GC.
+   * END GCJ LOCAL
    */
-  Object referent;
+  gnu.gcj.RawData referent;
+
+  /**
+   * This is like REFERENT but is not scanned by the GC.  We keep a
+   * copy around so that we can see when clear() has been called.
+   * GCJ LOCAL:
+   * This field doesn't exist in Classpath; we use it to detect
+   * clearing.
+   * END GCJ LOCAL
+   */
+  gnu.gcj.RawData copy;
 
   /**
    * The queue this reference is registered on. This is null, if this
@@ -97,7 +110,7 @@ public abstract class Reference
    */
   Reference(Object ref)
   {
-    referent = ref;
+    create (ref);
   }
 
   /**
@@ -112,10 +125,15 @@ public abstract class Reference
   {
     if (q == null)
       throw new NullPointerException();
-    referent = ref;
     queue = q;
+    create (ref);
   }
 
+  /**
+   * Notifies the VM that a new Reference has been created.
+   */
+  private native void create (Object o);
+
   /**
    * Returns the object, this reference refers to.
    * @return the object, this reference refers to, or null if the 
@@ -138,6 +156,7 @@ public abstract class Reference
   public void clear()
   {
     referent = null;
+    copy = null;
   }
 
   /**
-- 
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