duke@435: /*
iveresov@3536:  * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
stefank@2314: 
stefank@2314: #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
iveresov@3536: #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psScavenge.hpp"
coleenp@4037: #include "memory/iterator.hpp"
stefank@2314: 
duke@435: inline void PSScavenge::save_to_space_top_before_gc() {
duke@435:   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435:   _to_space_top_before_gc = heap->young_gen()->to_space()->top();
duke@435: }
duke@435: 
coleenp@548: template <class T> inline bool PSScavenge::should_scavenge(T* p) {
coleenp@548:   T heap_oop = oopDesc::load_heap_oop(p);
coleenp@548:   if (oopDesc::is_null(heap_oop)) return false;
coleenp@548:   oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
coleenp@548:   return PSScavenge::is_obj_in_young((HeapWord*)obj);
duke@435: }
duke@435: 
coleenp@548: template <class T>
coleenp@548: inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
duke@435:   if (should_scavenge(p)) {
coleenp@548:     oop obj = oopDesc::load_decode_heap_oop_not_null(p);
duke@435:     // Skip objects copied to to_space since the scavenge started.
coleenp@548:     HeapWord* const addr = (HeapWord*)obj;
duke@435:     return addr < to_space_top_before_gc() || addr >= to_space->end();
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
coleenp@548: template <class T>
coleenp@548: inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
duke@435:   if (check_to_space) {
coleenp@548:     ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435:     return should_scavenge(p, heap->young_gen()->to_space());
duke@435:   }
duke@435:   return should_scavenge(p);
duke@435: }
duke@435: 
duke@435: // Attempt to "claim" oop at p via CAS, push the new obj if successful
duke@435: // This version tests the oop* to make sure it is within the heap before
duke@435: // attempting marking.
iveresov@3536: template <class T, bool promote_immediately>
duke@435: inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
coleenp@548:                                                    T*                  p) {
coleenp@548:   assert(should_scavenge(p, true), "revisiting object?");
duke@435: 
coleenp@548:   oop o = oopDesc::load_decode_heap_oop_not_null(p);
coleenp@548:   oop new_obj = o->is_forwarded()
coleenp@548:         ? o->forwardee()
iveresov@3536:         : pm->copy_to_survivor_space<promote_immediately>(o);
coleenp@4037: 
coleenp@4037: #ifndef PRODUCT
coleenp@4037:   // This code must come after the CAS test, or it will print incorrect
coleenp@4037:   // information.
coleenp@4037:   if (TraceScavenge &&  o->is_forwarded()) {
coleenp@4037:     gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
coleenp@4037:        "forwarding",
coleenp@4037:        new_obj->klass()->internal_name(), o, new_obj, new_obj->size());
coleenp@4037:   }
coleenp@4037: #endif
coleenp@4037: 
coleenp@548:   oopDesc::encode_store_heap_oop_not_null(p, new_obj);
duke@435: 
duke@435:   // We cannot mark without test, as some code passes us pointers
coleenp@4037:   // that are outside the heap. These pointers are either from roots
coleenp@4037:   // or from metadata.
coleenp@548:   if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
duke@435:       Universe::heap()->is_in_reserved(p)) {
coleenp@548:     if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
coleenp@548:       card_table()->inline_write_ref_field_gc(p, new_obj);
duke@435:     }
duke@435:   }
duke@435: }
stefank@2314: 
iveresov@3536: template<bool promote_immediately>
iveresov@3536: class PSRootsClosure: public OopClosure {
jcoomes@2661:  private:
jcoomes@2661:   PSPromotionManager* _promotion_manager;
jcoomes@2661: 
jcoomes@2661:  protected:
jcoomes@2661:   template <class T> void do_oop_work(T *p) {
jcoomes@2661:     if (PSScavenge::should_scavenge(p)) {
jcoomes@2661:       // We never card mark roots, maybe call a func without test?
iveresov@3536:       PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p);
jcoomes@2661:     }
jcoomes@2661:   }
jcoomes@2661:  public:
iveresov@3536:   PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
iveresov@3536:   void do_oop(oop* p)       { PSRootsClosure::do_oop_work(p); }
iveresov@3536:   void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); }
jcoomes@2661: };
jcoomes@2661: 
iveresov@3536: typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure;
iveresov@3536: typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure;
iveresov@3536: 
coleenp@4037: // Scavenges a single oop in a Klass.
coleenp@4037: class PSScavengeFromKlassClosure: public OopClosure {
coleenp@4037:  private:
coleenp@4037:   PSPromotionManager* _pm;
coleenp@4037:   // Used to redirty a scanned klass if it has oops
coleenp@4037:   // pointing to the young generation after being scanned.
coleenp@4037:   Klass*             _scanned_klass;
coleenp@4037:  public:
coleenp@4037:   PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { }
coleenp@4037:   void do_oop(narrowOop* p) { ShouldNotReachHere(); }
coleenp@4037:   void do_oop(oop* p)       {
coleenp@4037:     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
coleenp@4037:     assert(!psh->is_in_reserved(p), "GC barrier needed");
coleenp@4037:     if (PSScavenge::should_scavenge(p)) {
coleenp@4037:       assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?");
coleenp@4037:       assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
coleenp@4037: 
coleenp@4037:       oop o = *p;
coleenp@4037:       oop new_obj;
coleenp@4037:       if (o->is_forwarded()) {
coleenp@4037:         new_obj = o->forwardee();
coleenp@4037:       } else {
coleenp@4037:         new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
coleenp@4037:       }
coleenp@4037:       oopDesc::encode_store_heap_oop_not_null(p, new_obj);
coleenp@4037: 
coleenp@4037:       if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
coleenp@4037:         do_klass_barrier();
coleenp@4037:       }
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   void set_scanned_klass(Klass* klass) {
coleenp@4037:     assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time");
coleenp@4037:     _scanned_klass = klass;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:  private:
coleenp@4037:   void do_klass_barrier() {
coleenp@4037:     assert(_scanned_klass != NULL, "Should not be called without having a scanned klass");
coleenp@4037:     _scanned_klass->record_modified_oops();
coleenp@4037:   }
coleenp@4037: 
coleenp@4037: };
coleenp@4037: 
coleenp@4037: // Scavenges the oop in a Klass.
coleenp@4037: class PSScavengeKlassClosure: public KlassClosure {
coleenp@4037:  private:
coleenp@4037:   PSScavengeFromKlassClosure _oop_closure;
coleenp@4037:  protected:
coleenp@4037:  public:
coleenp@4037:   PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { }
coleenp@4037:   void do_klass(Klass* klass) {
coleenp@4037:     // If the klass has not been dirtied we know that there's
coleenp@4037:     // no references into  the young gen and we can skip it.
coleenp@4037: 
coleenp@4037: #ifndef PRODUCT
coleenp@4037:     if (TraceScavenge) {
coleenp@4037:       ResourceMark rm;
coleenp@4037:       gclog_or_tty->print_cr("PSScavengeKlassClosure::do_klass %p, %s, dirty: %s",
coleenp@4037:                              klass,
coleenp@4037:                              klass->external_name(),
coleenp@4037:                              klass->has_modified_oops() ? "true" : "false");
coleenp@4037:     }
coleenp@4037: #endif
coleenp@4037: 
coleenp@4037:     if (klass->has_modified_oops()) {
coleenp@4037:       // Clean the klass since we're going to scavenge all the metadata.
coleenp@4037:       klass->clear_modified_oops();
coleenp@4037: 
coleenp@4037:       // Setup the promotion manager to redirty this klass
coleenp@4037:       // if references are left in the young gen.
coleenp@4037:       _oop_closure.set_scanned_klass(klass);
coleenp@4037: 
coleenp@4037:       klass->oops_do(&_oop_closure);
coleenp@4037: 
coleenp@4037:       _oop_closure.set_scanned_klass(NULL);
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: };
coleenp@4037: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP