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diff src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 2037:b03260081e9b

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7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field Summary: Initialize the _is_alive_non_header field of G1's reference processor with an instance of the G1CMIsAliveClosure. This will stop adding reference objects with live referents to the discovered reference lists unnecessarily. Reviewed-by: tonyp, ysr, jwilhelm, brutisso
author johnc
date Fri, 17 Dec 2010 11:26:53 -0800
parents f95d63e2154a
children 0fa27f37d4d4
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Thu Dec 16 09:14:34 2010 -0800
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Fri Dec 17 11:26:53 2010 -0800
@@ -33,6 +33,25 @@
 typedef GenericTaskQueue<oop>            CMTaskQueue;
 typedef GenericTaskQueueSet<CMTaskQueue> CMTaskQueueSet;
 
+// Closure used by CM during concurrent reference discovery
+// and reference processing (during remarking) to determine
+// if a particular object is alive. It is primarily used
+// to determine if referents of discovered reference objects
+// are alive. An instance is also embedded into the
+// reference processor as the _is_alive_non_header field
+class G1CMIsAliveClosure: public BoolObjectClosure {
+  G1CollectedHeap* _g1;
+ public:
+  G1CMIsAliveClosure(G1CollectedHeap* g1) :
+    _g1(g1)
+  {}
+
+  void do_object(oop obj) {
+    ShouldNotCallThis();
+  }
+  bool do_object_b(oop obj);
+};
+
 // A generic CM bit map.  This is essentially a wrapper around the BitMap
 // class, with one bit per (1<<_shifter) HeapWords.