jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1ConcurrentMarkObjArrayProcessor.cpp@8c95980d0b66

     1 /*

     2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #include "precompiled.hpp"

    26 #include "gc_implementation/g1/concurrentMark.inline.hpp"

    27 #include "gc_implementation/g1/g1ConcurrentMarkObjArrayProcessor.inline.hpp"

    29 oop G1CMObjArrayProcessor::encode_array_slice(HeapWord* addr) {

    30   return oop((void*)((uintptr_t)addr | ArraySliceBit));

    31 }

    33 HeapWord* G1CMObjArrayProcessor::decode_array_slice(oop value) {

    34   assert(is_array_slice(value), err_msg("Given value " PTR_FORMAT " is not an array slice", p2i(value)));

    35   return (HeapWord*)((uintptr_t)(void*)value & ~ArraySliceBit);

    36 }

    38 void G1CMObjArrayProcessor::push_array_slice(HeapWord* what) {

    39   oop obj = encode_array_slice(what);

    40   _task->push(obj);

    41 }

    43 size_t G1CMObjArrayProcessor::process_array_slice(objArrayOop obj, HeapWord* start_from, size_t remaining) {

    44   size_t words_to_scan = MIN2(remaining, ObjArrayMarkingStride);

    46   if (remaining > ObjArrayMarkingStride) {

    47     push_array_slice(start_from + ObjArrayMarkingStride);

    48   }

    50   // Then process current area.

    51   MemRegion mr(start_from, words_to_scan);

    52   return _task->scan_objArray(obj, mr);

    53 }

    55 size_t G1CMObjArrayProcessor::process_obj(oop obj) {

    56   assert(should_be_sliced(obj), err_msg("Must be an array object %d and large " SIZE_FORMAT, obj->is_objArray(), (size_t)obj->size()));

    58   return process_array_slice(objArrayOop(obj), (HeapWord*)obj, (size_t)objArrayOop(obj)->size());

    59 }

    61 size_t G1CMObjArrayProcessor::process_slice(oop obj) {

    62   HeapWord* const decoded_address = decode_array_slice(obj);

    64   // Find the start address of the objArrayOop.

    65   // Shortcut the BOT access if the given address is from a humongous object. The BOT

    66   // slide is fast enough for "smaller" objects in non-humongous regions, but is slower

    67   // than directly using heap region table.

    68   G1CollectedHeap* g1h = G1CollectedHeap::heap();

    69   HeapRegion* r = g1h->heap_region_containing(decoded_address);

    71   HeapWord* const start_address = r->isHumongous() ?

    72                                   r->humongous_start_region()->bottom() :

    73                                   g1h->block_start(decoded_address);

    75   assert(oop(start_address)->is_objArray(), err_msg("Address " PTR_FORMAT " does not refer to an object array ", p2i(start_address)));

    76   assert(start_address < decoded_address,

    77          err_msg("Object start address " PTR_FORMAT " must be smaller than decoded address " PTR_FORMAT,

    78          p2i(start_address),

    79          p2i(decoded_address)));

    81   objArrayOop objArray = objArrayOop(start_address);

    83   size_t already_scanned = decoded_address - start_address;

    84   size_t remaining = objArray->size() - already_scanned;

    86   return process_array_slice(objArray, decoded_address, remaining);

    87 }

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