jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp

Thu, 23 Oct 2014 12:02:08 -0700

author: asaha
date: Thu, 23 Oct 2014 12:02:08 -0700
changeset 7476: c2844108a708
parent 7218: 6948da6d7c13
child 7645: f2e3f0e1f97d
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 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_G1_G1PARSCANTHREADSTATE_INLINE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP
 #include "gc_implementation/g1/g1ParScanThreadState.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
 #include "oops/oop.inline.hpp"
 template <class T> void G1ParScanThreadState::do_oop_evac(T* p, HeapRegion* from) {
   assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)),
          "Reference should not be NULL here as such are never pushed to the task queue.");
   oop obj = oopDesc::load_decode_heap_oop_not_null(p);
   // Although we never intentionally push references outside of the collection
   // set, due to (benign) races in the claim mechanism during RSet scanning more
   // than one thread might claim the same card. So the same card may be
   // processed multiple times. So redo this check.
   G1CollectedHeap::in_cset_state_t in_cset_state = _g1h->in_cset_state(obj);
   if (in_cset_state == G1CollectedHeap::InCSet) {
     oop forwardee;
     if (obj->is_forwarded()) {
       forwardee = obj->forwardee();
     } else {
       forwardee = copy_to_survivor_space(obj);
     }
     oopDesc::encode_store_heap_oop(p, forwardee);
   } else if (in_cset_state == G1CollectedHeap::IsHumongous) {
     _g1h->set_humongous_is_live(obj);
   } else {
     assert(in_cset_state == G1CollectedHeap::InNeither,
            err_msg("In_cset_state must be InNeither here, but is %d", in_cset_state));
   }
   assert(obj != NULL, "Must be");
   update_rs(from, p, queue_num());
 }
 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) {
   assert(has_partial_array_mask(p), "invariant");
   oop from_obj = clear_partial_array_mask(p);
   assert(Universe::heap()->is_in_reserved(from_obj), "must be in heap.");
   assert(from_obj->is_objArray(), "must be obj array");
   objArrayOop from_obj_array = objArrayOop(from_obj);
   // The from-space object contains the real length.
   int length                 = from_obj_array->length();
   assert(from_obj->is_forwarded(), "must be forwarded");
   oop to_obj                 = from_obj->forwardee();
   assert(from_obj != to_obj, "should not be chunking self-forwarded objects");
   objArrayOop to_obj_array   = objArrayOop(to_obj);
   // We keep track of the next start index in the length field of the
   // to-space object.
   int next_index             = to_obj_array->length();
   assert(0 <= next_index && next_index < length,
          err_msg("invariant, next index: %d, length: %d", next_index, length));
   int start                  = next_index;
   int end                    = length;
   int remainder              = end - start;
   // We'll try not to push a range that's smaller than ParGCArrayScanChunk.
   if (remainder > 2 * ParGCArrayScanChunk) {
     end = start + ParGCArrayScanChunk;
     to_obj_array->set_length(end);
     // Push the remainder before we process the range in case another
     // worker has run out of things to do and can steal it.
     oop* from_obj_p = set_partial_array_mask(from_obj);
     push_on_queue(from_obj_p);
   } else {
     assert(length == end, "sanity");
     // We'll process the final range for this object. Restore the length
     // so that the heap remains parsable in case of evacuation failure.
     to_obj_array->set_length(end);
   }
   _scanner.set_region(_g1h->heap_region_containing_raw(to_obj));
   // Process indexes [start,end). It will also process the header
   // along with the first chunk (i.e., the chunk with start == 0).
   // Note that at this point the length field of to_obj_array is not
   // correct given that we are using it to keep track of the next
   // start index. oop_iterate_range() (thankfully!) ignores the length
   // field and only relies on the start / end parameters.  It does
   // however return the size of the object which will be incorrect. So
   // we have to ignore it even if we wanted to use it.
   to_obj_array->oop_iterate_range(&_scanner, start, end);
 }
 template <class T> inline void G1ParScanThreadState::deal_with_reference(T* ref_to_scan) {
   if (!has_partial_array_mask(ref_to_scan)) {
     // Note: we can use "raw" versions of "region_containing" because
     // "obj_to_scan" is definitely in the heap, and is not in a
     // humongous region.
     HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan);
     do_oop_evac(ref_to_scan, r);
   } else {
     do_oop_partial_array((oop*)ref_to_scan);
   }
 }
 inline void G1ParScanThreadState::dispatch_reference(StarTask ref) {
   assert(verify_task(ref), "sanity");
   if (ref.is_narrow()) {
     deal_with_reference((narrowOop*)ref);
   } else {
     deal_with_reference((oop*)ref);
   }
 }
 void G1ParScanThreadState::steal_and_trim_queue(RefToScanQueueSet *task_queues) {
   StarTask stolen_task;
   while (task_queues->steal(queue_num(), hash_seed(), stolen_task)) {
     assert(verify_task(stolen_task), "sanity");
     dispatch_reference(stolen_task);
     // We've just processed a reference and we might have made
     // available new entries on the queues. So we have to make sure
     // we drain the queues as necessary.
     trim_queue();
   }
 }
 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_INLINE_HPP */

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp