--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp Wed Jun 04 13:51:09 2008 -0700
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp Thu Jun 05 15:57:56 2008 -0700
@@ -184,6 +184,20 @@
size_t tlab_capacity(Thread* thr) const;
size_t unsafe_max_tlab_alloc(Thread* thr) const;
+ // Can a compiler initialize a new object without store barriers?
+ // This permission only extends from the creation of a new object
+ // via a TLAB up to the first subsequent safepoint.
+ virtual bool can_elide_tlab_store_barriers() const {
+ return true;
+ }
+
+ // Can a compiler elide a store barrier when it writes
+ // a permanent oop into the heap? Applies when the compiler
+ // is storing x to the heap, where x->is_perm() is true.
+ virtual bool can_elide_permanent_oop_store_barriers() const {
+ return true;
+ }
+
void oop_iterate(OopClosure* cl);
void object_iterate(ObjectClosure* cl);
void permanent_oop_iterate(OopClosure* cl);