jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp@710a3c8b516e (annotated)

src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp@710a3c8b516e (annotated)

src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author: aoqi
date: Tue, 08 Aug 2017 15:57:29 +0800
changeset 6876: 710a3c8b516e
parent 6680: 78bbf4d43a14
parent 421: 7af4c98e9b67
child 9138: b56ab8e56604
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2002, 2014, 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_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
 #include "memory/iterator.hpp"
 inline void PSScavenge::save_to_space_top_before_gc() {
   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
   _to_space_top_before_gc = heap->young_gen()->to_space()->top();
 }
 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
   T heap_oop = oopDesc::load_heap_oop(p);
   return PSScavenge::is_obj_in_young(heap_oop);
 }
 template <class T>
 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
   if (should_scavenge(p)) {
     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
     // Skip objects copied to to_space since the scavenge started.
     HeapWord* const addr = (HeapWord*)obj;
     return addr < to_space_top_before_gc() || addr >= to_space->end();
   }
   return false;
 }
 template <class T>
 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
   if (check_to_space) {
     ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
     return should_scavenge(p, heap->young_gen()->to_space());
   }
   return should_scavenge(p);
 }
 // Attempt to "claim" oop at p via CAS, push the new obj if successful
 // This version tests the oop* to make sure it is within the heap before
 // attempting marking.
 template <class T, bool promote_immediately>
 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
                                                    T*                  p) {
   assert(should_scavenge(p, true), "revisiting object?");
   oop o = oopDesc::load_decode_heap_oop_not_null(p);
 #ifdef MIPS64
   if (oopDesc::is_null(o)) return;
 #endif
   oop new_obj = o->is_forwarded()
         ? o->forwardee()
         : pm->copy_to_survivor_space<promote_immediately>(o);
 #ifndef PRODUCT
   // This code must come after the CAS test, or it will print incorrect
   // information.
   if (TraceScavenge &&  o->is_forwarded()) {
     gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
        "forwarding",
        new_obj->klass()->internal_name(), p2i((void *)o), p2i((void *)new_obj), new_obj->size());
   }
 #endif
   oopDesc::encode_store_heap_oop_not_null(p, new_obj);
   // We cannot mark without test, as some code passes us pointers
   // that are outside the heap. These pointers are either from roots
   // or from metadata.
   if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
       Universe::heap()->is_in_reserved(p)) {
     if (PSScavenge::is_obj_in_young(new_obj)) {
       card_table()->inline_write_ref_field_gc(p, new_obj);
     }
   }
 }
 template<bool promote_immediately>
 class PSRootsClosure: public OopClosure {
  private:
   PSPromotionManager* _promotion_manager;
  protected:
   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?
       PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, 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 Klass.
 class PSScavengeFromKlassClosure: public OopClosure {
  private:
   PSPromotionManager* _pm;
   // Used to redirty a scanned klass if it has oops
   // pointing to the young generation after being scanned.
   Klass*             _scanned_klass;
  public:
   PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(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(!Universe::heap()->is_in_reserved(p), "Not from meta-data?");
       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);
       }
       oopDesc::encode_store_heap_oop_not_null(p, new_obj);
       if (PSScavenge::is_obj_in_young(new_obj)) {
         do_klass_barrier();
       }
     }
   }
   void set_scanned_klass(Klass* klass) {
     assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time");
     _scanned_klass = klass;
   }
  private:
   void do_klass_barrier() {
     assert(_scanned_klass != NULL, "Should not be called without having a scanned klass");
     _scanned_klass->record_modified_oops();
   }
 };
 // Scavenges the oop in a Klass.
 class PSScavengeKlassClosure: public KlassClosure {
  private:
   PSScavengeFromKlassClosure _oop_closure;
  protected:
  public:
   PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { }
   void do_klass(Klass* klass) {
     // If the klass has not been dirtied we know that there's
     // no references into  the young gen and we can skip it.
 #ifndef PRODUCT
     if (TraceScavenge) {
       ResourceMark rm;
       gclog_or_tty->print_cr("PSScavengeKlassClosure::do_klass %p, %s, dirty: %s",
                              klass,
                              klass->external_name(),
                              klass->has_modified_oops() ? "true" : "false");
     }
 #endif
     if (klass->has_modified_oops()) {
       // Clean the klass since we're going to scavenge all the metadata.
       klass->clear_modified_oops();
       // Setup the promotion manager to redirty this klass
       // if references are left in the young gen.
       _oop_closure.set_scanned_klass(klass);
       klass->oops_do(&_oop_closure);
       _oop_closure.set_scanned_klass(NULL);
     }
   }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp@710a3c8b516e (annotated)

src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp