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src/hotspot/share/gc/g1/g1OopClosures.hpp
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rev 52316 : imported patch 8212911-unify-reference-handling-during-gc
rev 52317 : imported patch 8212911-stefanj-review
rev 52319 : imported patch 8213142-use-raii-to-set-scanning-from-young
@@ -34,10 +34,11 @@
class G1RemSet;
class G1ConcurrentMark;
class DirtyCardToOopClosure;
class G1CMBitMap;
class G1ParScanThreadState;
+class G1ScanEvacuatedObjClosure;
class G1CMTask;
class ReferenceProcessor;
class G1ScanClosureBase : public BasicOopIterateClosure {
protected:
@@ -80,19 +81,26 @@
template <class T> void do_oop_work(T* p);
virtual void do_oop(oop* p) { do_oop_work(p); }
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
};
+
// This closure is applied to the fields of the objects that have just been copied during evacuation.
class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
- bool _scanning_in_young;
+ friend class G1ScanInYoungSetter;
+
+ enum ScanningInYoungValues {
+ False = 0,
+ True,
+ Uninitialized
+ };
+
+ ScanningInYoungValues _scanning_in_young;
public:
G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
- G1ScanClosureBase(g1h, par_scan_state), _scanning_in_young(false) { }
-
- void set_scanning_in_young(bool scanning_in_young) { _scanning_in_young = scanning_in_young; }
+ G1ScanClosureBase(g1h, par_scan_state), _scanning_in_young(Uninitialized) { }
template <class T> void do_oop_work(T* p);
virtual void do_oop(oop* p) { do_oop_work(p); }
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
@@ -102,10 +110,25 @@
void set_ref_discoverer(ReferenceDiscoverer* rd) {
set_ref_discoverer_internal(rd);
}
};
+// RAII object to properly set the _scanning_in_young field in G1ScanEvacuatedObjClosure.
+class G1ScanInYoungSetter : public StackObj {
+ G1ScanEvacuatedObjClosure* _closure;
+
+public:
+ G1ScanInYoungSetter(G1ScanEvacuatedObjClosure* closure, bool new_value) : _closure(closure) {
+ assert(_closure->_scanning_in_young == G1ScanEvacuatedObjClosure::Uninitialized, "Must not be set");
+ _closure->_scanning_in_young = new_value ? G1ScanEvacuatedObjClosure::True : G1ScanEvacuatedObjClosure::False;
+ }
+
+ ~G1ScanInYoungSetter() {
+ DEBUG_ONLY(_closure->_scanning_in_young = G1ScanEvacuatedObjClosure::Uninitialized;)
+ }
+};
+
// Add back base class for metadata
class G1ParCopyHelper : public OopClosure {
protected:
G1CollectedHeap* _g1h;
G1ParScanThreadState* _par_scan_state;
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