hotspot/src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp
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7199349: NPG: PS: Crash seen in jprt Reviewed-by: johnc
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/*
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 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP
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#include "gc_implementation/parallelScavenge/psOldGen.hpp"
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#include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
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#include "gc_implementation/parallelScavenge/psScavenge.hpp"
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inline PSPromotionManager* PSPromotionManager::manager_array(int index) {
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  assert(_manager_array != NULL, "access of NULL manager_array");
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  assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access");
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  return _manager_array[index];
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}
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template <class T>
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inline void PSPromotionManager::claim_or_forward_internal_depth(T* p) {
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  if (p != NULL) { // XXX: error if p != NULL here
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    oop o = oopDesc::load_decode_heap_oop_not_null(p);
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    if (o->is_forwarded()) {
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      o = o->forwardee();
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      // Card mark
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      if (PSScavenge::is_obj_in_young((HeapWord*) o)) {
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        PSScavenge::card_table()->inline_write_ref_field_gc(p, o);
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      }
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      oopDesc::encode_store_heap_oop_not_null(p, o);
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    } else {
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      push_depth(p);
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    }
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  }
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}
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template <class T>
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inline void PSPromotionManager::claim_or_forward_depth(T* p) {
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  assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
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  assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap,
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         "Sanity");
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  assert(Universe::heap()->is_in(p), "pointer outside heap");
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  claim_or_forward_internal_depth(p);
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}
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//
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// This method is pretty bulky. It would be nice to split it up
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// into smaller submethods, but we need to be careful not to hurt
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// performance.
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//
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template<bool promote_immediately>
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oop PSPromotionManager::copy_to_survivor_space(oop o) {
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  assert(PSScavenge::should_scavenge(&o), "Sanity");
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  oop new_obj = NULL;
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  // NOTE! We must be very careful with any methods that access the mark
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  // in o. There may be multiple threads racing on it, and it may be forwarded
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  // at any time. Do not use oop methods for accessing the mark!
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  markOop test_mark = o->mark();
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  // The same test as "o->is_forwarded()"
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  if (!test_mark->is_marked()) {
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    bool new_obj_is_tenured = false;
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    size_t new_obj_size = o->size();
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    if (!promote_immediately) {
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      // Find the objects age, MT safe.
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      int age = (test_mark->has_displaced_mark_helper() /* o->has_displaced_mark() */) ?
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        test_mark->displaced_mark_helper()->age() : test_mark->age();
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      // Try allocating obj in to-space (unless too old)
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      if (age < PSScavenge::tenuring_threshold()) {
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        new_obj = (oop) _young_lab.allocate(new_obj_size);
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        if (new_obj == NULL && !_young_gen_is_full) {
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          // Do we allocate directly, or flush and refill?
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          if (new_obj_size > (YoungPLABSize / 2)) {
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            // Allocate this object directly
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            new_obj = (oop)young_space()->cas_allocate(new_obj_size);
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          } else {
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            // Flush and fill
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            _young_lab.flush();
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            HeapWord* lab_base = young_space()->cas_allocate(YoungPLABSize);
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            if (lab_base != NULL) {
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              _young_lab.initialize(MemRegion(lab_base, YoungPLABSize));
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              // Try the young lab allocation again.
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              new_obj = (oop) _young_lab.allocate(new_obj_size);
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            } else {
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              _young_gen_is_full = true;
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            }
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          }
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        }
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      }
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    }
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    // Otherwise try allocating obj tenured
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    if (new_obj == NULL) {
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#ifndef PRODUCT
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      if (Universe::heap()->promotion_should_fail()) {
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        return oop_promotion_failed(o, test_mark);
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      }
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#endif  // #ifndef PRODUCT
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      new_obj = (oop) _old_lab.allocate(new_obj_size);
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      new_obj_is_tenured = true;
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      if (new_obj == NULL) {
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        if (!_old_gen_is_full) {
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          // Do we allocate directly, or flush and refill?
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          if (new_obj_size > (OldPLABSize / 2)) {
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            // Allocate this object directly
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            new_obj = (oop)old_gen()->cas_allocate(new_obj_size);
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          } else {
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            // Flush and fill
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            _old_lab.flush();
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            HeapWord* lab_base = old_gen()->cas_allocate(OldPLABSize);
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            if(lab_base != NULL) {
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#ifdef ASSERT
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              // Delay the initialization of the promotion lab (plab).
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              // This exposes uninitialized plabs to card table processing.
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              if (GCWorkerDelayMillis > 0) {
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                os::sleep(Thread::current(), GCWorkerDelayMillis, false);
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              }
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#endif
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              _old_lab.initialize(MemRegion(lab_base, OldPLABSize));
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              // Try the old lab allocation again.
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              new_obj = (oop) _old_lab.allocate(new_obj_size);
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            }
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          }
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        }
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        // This is the promotion failed test, and code handling.
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        // The code belongs here for two reasons. It is slightly
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        // different thatn the code below, and cannot share the
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        // CAS testing code. Keeping the code here also minimizes
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        // the impact on the common case fast path code.
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        if (new_obj == NULL) {
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          _old_gen_is_full = true;
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          return oop_promotion_failed(o, test_mark);
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        }
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      }
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    }
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    assert(new_obj != NULL, "allocation should have succeeded");
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    // Copy obj
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    Copy::aligned_disjoint_words((HeapWord*)o, (HeapWord*)new_obj, new_obj_size);
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    // Now we have to CAS in the header.
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    if (o->cas_forward_to(new_obj, test_mark)) {
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      // We won any races, we "own" this object.
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      assert(new_obj == o->forwardee(), "Sanity");
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      // Increment age if obj still in new generation. Now that
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      // we're dealing with a markOop that cannot change, it is
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      // okay to use the non mt safe oop methods.
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      if (!new_obj_is_tenured) {
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        new_obj->incr_age();
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        assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj");
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      }
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      // Do the size comparison first with new_obj_size, which we
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      // already have. Hopefully, only a few objects are larger than
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      // _min_array_size_for_chunking, and most of them will be arrays.
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      // So, the is->objArray() test would be very infrequent.
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      if (new_obj_size > _min_array_size_for_chunking &&
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          new_obj->is_objArray() &&
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          PSChunkLargeArrays) {
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        // we'll chunk it
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        oop* const masked_o = mask_chunked_array_oop(o);
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        push_depth(masked_o);
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        TASKQUEUE_STATS_ONLY(++_arrays_chunked; ++_masked_pushes);
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      } else {
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        // we'll just push its contents
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        new_obj->push_contents(this);
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      }
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    }  else {
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      // We lost, someone else "owns" this object
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      guarantee(o->is_forwarded(), "Object must be forwarded if the cas failed.");
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      // Try to deallocate the space.  If it was directly allocated we cannot
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      // deallocate it, so we have to test.  If the deallocation fails,
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      // overwrite with a filler object.
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      if (new_obj_is_tenured) {
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        if (!_old_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
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          CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
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        }
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      } else if (!_young_lab.unallocate_object((HeapWord*) new_obj, new_obj_size)) {
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        CollectedHeap::fill_with_object((HeapWord*) new_obj, new_obj_size);
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      }
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      // don't update this before the unallocation!
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      new_obj = o->forwardee();
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    }
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  } else {
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    assert(o->is_forwarded(), "Sanity");
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    new_obj = o->forwardee();
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  }
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#ifndef PRODUCT
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  // This code must come after the CAS test, or it will print incorrect
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  // information.
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  if (TraceScavenge) {
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    gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
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       PSScavenge::should_scavenge(&new_obj) ? "copying" : "tenuring",
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       new_obj->klass()->internal_name(), o, new_obj, new_obj->size());
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  }
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#endif
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  return new_obj;
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}
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inline void PSPromotionManager::process_popped_location_depth(StarTask p) {
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  if (is_oop_masked(p)) {
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    assert(PSChunkLargeArrays, "invariant");
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    oop const old = unmask_chunked_array_oop(p);
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    process_array_chunk(old);
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  } else {
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    if (p.is_narrow()) {
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      assert(UseCompressedOops, "Error");
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      PSScavenge::copy_and_push_safe_barrier<narrowOop, /*promote_immediately=*/false>(this, p);
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    } else {
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      PSScavenge::copy_and_push_safe_barrier<oop, /*promote_immediately=*/false>(this, p);
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    }
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  }
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}
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#if TASKQUEUE_STATS
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void PSPromotionManager::record_steal(StarTask& p) {
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  if (is_oop_masked(p)) {
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    ++_masked_steals;
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  }
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}
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#endif // TASKQUEUE_STATS
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#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_INLINE_HPP