--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1OopClosures.hpp Wed May 13 15:16:06 2015 +0200
@@ -0,0 +1,284 @@
+/*
+ * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
+#define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
+
+#include "memory/iterator.hpp"
+#include "oops/markOop.hpp"
+
+class HeapRegion;
+class G1CollectedHeap;
+class G1RemSet;
+class ConcurrentMark;
+class DirtyCardToOopClosure;
+class CMBitMap;
+class CMMarkStack;
+class G1ParScanThreadState;
+class CMTask;
+class ReferenceProcessor;
+
+// A class that scans oops in a given heap region (much as OopsInGenClosure
+// scans oops in a generation.)
+class OopsInHeapRegionClosure: public ExtendedOopClosure {
+protected:
+ HeapRegion* _from;
+public:
+ void set_region(HeapRegion* from) { _from = from; }
+};
+
+class G1ParClosureSuper : public OopsInHeapRegionClosure {
+protected:
+ G1CollectedHeap* _g1;
+ G1ParScanThreadState* _par_scan_state;
+ uint _worker_id;
+public:
+ // Initializes the instance, leaving _par_scan_state uninitialized. Must be done
+ // later using the set_par_scan_thread_state() method.
+ G1ParClosureSuper(G1CollectedHeap* g1);
+ G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
+ bool apply_to_weak_ref_discovered_field() { return true; }
+
+ void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state);
+};
+
+class G1ParPushHeapRSClosure : public G1ParClosureSuper {
+public:
+ G1ParPushHeapRSClosure(G1CollectedHeap* g1,
+ G1ParScanThreadState* par_scan_state):
+ G1ParClosureSuper(g1, par_scan_state) { }
+
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+class G1ParScanClosure : public G1ParClosureSuper {
+public:
+ G1ParScanClosure(G1CollectedHeap* g1, ReferenceProcessor* rp) :
+ G1ParClosureSuper(g1) {
+ assert(_ref_processor == NULL, "sanity");
+ _ref_processor = rp;
+ }
+
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+// Add back base class for metadata
+class G1ParCopyHelper : public G1ParClosureSuper {
+protected:
+ Klass* _scanned_klass;
+ ConcurrentMark* _cm;
+
+ // Mark the object if it's not already marked. This is used to mark
+ // objects pointed to by roots that are guaranteed not to move
+ // during the GC (i.e., non-CSet objects). It is MT-safe.
+ void mark_object(oop obj);
+
+ // Mark the object if it's not already marked. This is used to mark
+ // objects pointed to by roots that have been forwarded during a
+ // GC. It is MT-safe.
+ void mark_forwarded_object(oop from_obj, oop to_obj);
+ public:
+ G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
+
+ void set_scanned_klass(Klass* k) { _scanned_klass = k; }
+ template <class T> void do_klass_barrier(T* p, oop new_obj);
+};
+
+enum G1Barrier {
+ G1BarrierNone,
+ G1BarrierEvac,
+ G1BarrierKlass
+};
+
+enum G1Mark {
+ G1MarkNone,
+ G1MarkFromRoot,
+ G1MarkPromotedFromRoot
+};
+
+template <G1Barrier barrier, G1Mark do_mark_object>
+class G1ParCopyClosure : public G1ParCopyHelper {
+private:
+ template <class T> void do_oop_work(T* p);
+
+public:
+ G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
+ ReferenceProcessor* rp) :
+ G1ParCopyHelper(g1, par_scan_state) {
+ assert(_ref_processor == NULL, "sanity");
+ }
+
+ template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+
+ G1CollectedHeap* g1() { return _g1; };
+ G1ParScanThreadState* pss() { return _par_scan_state; }
+ ReferenceProcessor* rp() { return _ref_processor; };
+};
+
+typedef G1ParCopyClosure<G1BarrierNone, G1MarkNone> G1ParScanExtRootClosure;
+typedef G1ParCopyClosure<G1BarrierNone, G1MarkFromRoot> G1ParScanAndMarkExtRootClosure;
+typedef G1ParCopyClosure<G1BarrierNone, G1MarkPromotedFromRoot> G1ParScanAndMarkWeakExtRootClosure;
+// We use a separate closure to handle references during evacuation
+// failure processing.
+
+typedef G1ParCopyClosure<G1BarrierEvac, G1MarkNone> G1ParScanHeapEvacFailureClosure;
+
+class FilterIntoCSClosure: public ExtendedOopClosure {
+ G1CollectedHeap* _g1;
+ OopClosure* _oc;
+ DirtyCardToOopClosure* _dcto_cl;
+public:
+ FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
+ G1CollectedHeap* g1,
+ OopClosure* oc) :
+ _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
+
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+ bool apply_to_weak_ref_discovered_field() { return true; }
+};
+
+class FilterOutOfRegionClosure: public ExtendedOopClosure {
+ HeapWord* _r_bottom;
+ HeapWord* _r_end;
+ OopClosure* _oc;
+public:
+ FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+ bool apply_to_weak_ref_discovered_field() { return true; }
+};
+
+// Closure for iterating over object fields during concurrent marking
+class G1CMOopClosure : public MetadataAwareOopClosure {
+protected:
+ ConcurrentMark* _cm;
+private:
+ G1CollectedHeap* _g1h;
+ CMTask* _task;
+public:
+ G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop( oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+// Closure to scan the root regions during concurrent marking
+class G1RootRegionScanClosure : public MetadataAwareOopClosure {
+private:
+ G1CollectedHeap* _g1h;
+ ConcurrentMark* _cm;
+ uint _worker_id;
+public:
+ G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
+ uint worker_id) :
+ _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop( oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+// Closure that applies the given two closures in sequence.
+// Used by the RSet refinement code (when updating RSets
+// during an evacuation pause) to record cards containing
+// pointers into the collection set.
+
+class G1Mux2Closure : public ExtendedOopClosure {
+ OopClosure* _c1;
+ OopClosure* _c2;
+public:
+ G1Mux2Closure(OopClosure *c1, OopClosure *c2);
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+// A closure that returns true if it is actually applied
+// to a reference
+
+class G1TriggerClosure : public ExtendedOopClosure {
+ bool _triggered;
+public:
+ G1TriggerClosure();
+ bool triggered() const { return _triggered; }
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+// A closure which uses a triggering closure to determine
+// whether to apply an oop closure.
+
+class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
+ G1TriggerClosure* _trigger_cl;
+ OopClosure* _oop_cl;
+public:
+ G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+};
+
+class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
+ G1CollectedHeap* _g1;
+ G1RemSet* _g1_rem_set;
+ HeapRegion* _from;
+ G1ParPushHeapRSClosure* _push_ref_cl;
+ bool _record_refs_into_cset;
+ uint _worker_i;
+
+public:
+ G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
+ G1RemSet* rs,
+ G1ParPushHeapRSClosure* push_ref_cl,
+ bool record_refs_into_cset,
+ uint worker_i = 0);
+
+ void set_from(HeapRegion* from) {
+ assert(from != NULL, "from region must be non-NULL");
+ _from = from;
+ }
+
+ bool self_forwarded(oop obj) {
+ markOop m = obj->mark();
+ bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj));
+ return result;
+ }
+
+ bool apply_to_weak_ref_discovered_field() { return true; }
+
+ template <class T> void do_oop_nv(T* p);
+ virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
+ virtual void do_oop(oop* p) { do_oop_nv(p); }
+};
+
+#endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP