8201436: Replace oop_ps_push_contents with oop_iterate and closure

Reviewed-by: sjohanss, tschatzl

src/hotspot/share/gc/parallel/psClosure.inline.hpp

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2018, 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_PARALLEL_PSCLOSURE_INLINE_HPP
+#define SHARE_VM_GC_PARALLEL_PSCLOSURE_INLINE_HPP
+
+#include "gc/parallel/psPromotionManager.inline.hpp"
+#include "gc/parallel/psScavenge.inline.hpp"
+#include "memory/iterator.hpp"
+#include "oops/access.inline.hpp"
+#include "oops/oop.inline.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+template <bool promote_immediately>
+class PSRootsClosure: public OopClosure {
+private:
+  PSPromotionManager* _promotion_manager;
+
+  template <class T> void do_oop_work(T *p) {
+    if (PSScavenge::should_scavenge(p)) {
+      // We never card mark roots, maybe call a func without test?
+      _promotion_manager->copy_and_push_safe_barrier<T, promote_immediately>(p);
+    }
+  }
+public:
+  PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
+  void do_oop(oop* p)       { PSRootsClosure::do_oop_work(p); }
+  void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); }
+};
+
+typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure;
+typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure;
+
+// Scavenges a single oop in a ClassLoaderData.
+class PSScavengeFromCLDClosure: public OopClosure {
+private:
+  PSPromotionManager* _pm;
+  // Used to redirty a scanned cld if it has oops
+  // pointing to the young generation after being scanned.
+  ClassLoaderData*    _scanned_cld;
+public:
+  PSScavengeFromCLDClosure(PSPromotionManager* pm) : _pm(pm), _scanned_cld(NULL) { }
+  void do_oop(narrowOop* p) { ShouldNotReachHere(); }
+  void do_oop(oop* p)       {
+    ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
+    assert(!psh->is_in_reserved(p), "GC barrier needed");
+    if (PSScavenge::should_scavenge(p)) {
+      assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
+
+      oop o = *p;
+      oop new_obj;
+      if (o->is_forwarded()) {
+        new_obj = o->forwardee();
+      } else {
+        new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
+      }
+      RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
+
+      if (PSScavenge::is_obj_in_young(new_obj)) {
+        do_cld_barrier();
+      }
+    }
+  }
+
+  void set_scanned_cld(ClassLoaderData* cld) {
+    assert(_scanned_cld == NULL || cld == NULL, "Should always only handling one cld at a time");
+    _scanned_cld = cld;
+  }
+
+private:
+  void do_cld_barrier() {
+    assert(_scanned_cld != NULL, "Should not be called without having a scanned cld");
+    _scanned_cld->record_modified_oops();
+  }
+};
+
+// Scavenges the oop in a ClassLoaderData.
+class PSScavengeCLDClosure: public CLDClosure {
+private:
+  PSScavengeFromCLDClosure _oop_closure;
+public:
+  PSScavengeCLDClosure(PSPromotionManager* pm) : _oop_closure(pm) { }
+  void do_cld(ClassLoaderData* cld) {
+    // If the cld has not been dirtied we know that there's
+    // no references into  the young gen and we can skip it.
+
+    if (cld->has_modified_oops()) {
+      // Setup the promotion manager to redirty this cld
+      // if references are left in the young gen.
+      _oop_closure.set_scanned_cld(cld);
+
+      // Clean the cld since we're going to scavenge all the metadata.
+      cld->oops_do(&_oop_closure, false, /*clear_modified_oops*/true);
+
+      _oop_closure.set_scanned_cld(NULL);
+    }
+  }
+};
+
+#endif