--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/g1RootClosures.cpp Wed Oct 14 14:50:43 2015 +0200
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 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.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#include "gc/g1/bufferingOopClosure.hpp"
+#include "gc/g1/g1CodeBlobClosure.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/g1/g1OopClosures.inline.hpp"
+#include "gc/g1/g1RootClosures.hpp"
+
+class G1ParScanThreadState;
+
+// Simple holder object for a complete set of closures used by the G1 evacuation code.
+template <G1Mark Mark>
+class G1SharedClosures VALUE_OBJ_CLASS_SPEC {
+public:
+ G1ParCopyClosure<G1BarrierNone, Mark> _oops;
+ G1ParCopyClosure<G1BarrierKlass, Mark> _oop_in_klass;
+ G1KlassScanClosure _klass_in_cld_closure;
+ CLDToKlassAndOopClosure _clds;
+ G1CodeBlobClosure _codeblobs;
+ BufferingOopClosure _buffered_oops;
+
+ G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty_klasses, bool must_claim_cld) :
+ _oops(g1h, pss),
+ _oop_in_klass(g1h, pss),
+ _klass_in_cld_closure(&_oop_in_klass, process_only_dirty_klasses),
+ _clds(&_klass_in_cld_closure, &_oops, must_claim_cld),
+ _codeblobs(&_oops),
+ _buffered_oops(&_oops) {}
+};
+
+class G1EvacuationClosures : public G1EvacuationRootClosures {
+ G1SharedClosures<G1MarkNone> _closures;
+
+public:
+ G1EvacuationClosures(G1CollectedHeap* g1h,
+ G1ParScanThreadState* pss,
+ bool gcs_are_young) :
+ _closures(g1h, pss, gcs_are_young, /* must_claim_cld */ false) {}
+
+ OopClosure* weak_oops() { return &_closures._buffered_oops; }
+ OopClosure* strong_oops() { return &_closures._buffered_oops; }
+
+ CLDClosure* weak_clds() { return &_closures._clds; }
+ CLDClosure* strong_clds() { return &_closures._clds; }
+ CLDClosure* thread_root_clds() { return NULL; }
+ CLDClosure* second_pass_weak_clds() { return NULL; }
+
+ CodeBlobClosure* strong_codeblobs() { return &_closures._codeblobs; }
+ CodeBlobClosure* weak_codeblobs() { return &_closures._codeblobs; }
+
+ void flush() { _closures._buffered_oops.done(); }
+ double closure_app_seconds() { return _closures._buffered_oops.closure_app_seconds(); }
+
+ OopClosure* raw_strong_oops() { return &_closures._oops; }
+
+ bool trace_metadata() { return false; }
+};
+
+// Closures used during initial mark.
+// The treatment of "weak" roots is selectable through the template parameter,
+// this is usually used to control unloading of classes and interned strings.
+template <G1Mark MarkWeak>
+class G1InitalMarkClosures : public G1EvacuationRootClosures {
+ G1SharedClosures<G1MarkFromRoot> _strong;
+ G1SharedClosures<MarkWeak> _weak;
+
+ // Filter method to help with returning the appropriate closures
+ // depending on the class template parameter.
+ template <G1Mark Mark, typename T>
+ T* null_if(T* t) {
+ if (Mark == MarkWeak) {
+ return NULL;
+ }
+ return t;
+ }
+
+public:
+ G1InitalMarkClosures(G1CollectedHeap* g1h,
+ G1ParScanThreadState* pss) :
+ _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true),
+ _weak(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true) {}
+
+ OopClosure* weak_oops() { return &_weak._buffered_oops; }
+ OopClosure* strong_oops() { return &_strong._buffered_oops; }
+
+ // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass.
+ CLDClosure* weak_clds() { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); }
+ CLDClosure* strong_clds() { return &_strong._clds; }
+
+ // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants
+ // return a NULL closure for the following specialized versions in that case.
+ CLDClosure* thread_root_clds() { return null_if<G1MarkFromRoot>(&_strong._clds); }
+ CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); }
+
+ CodeBlobClosure* strong_codeblobs() { return &_strong._codeblobs; }
+ CodeBlobClosure* weak_codeblobs() { return &_weak._codeblobs; }
+
+ void flush() {
+ _strong._buffered_oops.done();
+ _weak._buffered_oops.done();
+ }
+
+ double closure_app_seconds() {
+ return _strong._buffered_oops.closure_app_seconds() +
+ _weak._buffered_oops.closure_app_seconds();
+ }
+
+ OopClosure* raw_strong_oops() { return &_strong._oops; }
+
+ // If we are not marking all weak roots then we are tracing
+ // which metadata is alive.
+ bool trace_metadata() { return MarkWeak == G1MarkPromotedFromRoot; }
+};
+
+G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) {
+ if (g1h->collector_state()->during_initial_mark_pause()) {
+ if (ClassUnloadingWithConcurrentMark) {
+ return new G1InitalMarkClosures<G1MarkPromotedFromRoot>(g1h, pss);
+ } else {
+ return new G1InitalMarkClosures<G1MarkFromRoot>(g1h, pss);
+ }
+ } else {
+ return new G1EvacuationClosures(g1h, pss, g1h->collector_state()->gcs_are_young());
+ }
+}