jdk8-mips64-public/hotspot: src/share/vm/oops/arrayOop.cpp@55a0da3d420b

8027675: Full collections with Serial slower in JDK 8 compared to 7u40
Summary: Reduced the number of calls to follow_class_loader and instead marked and pushed the klass holder directly. Also removed unneeded calls to adjust_klass.
Reviewed-by: coleenp, jmasa, mgerdin, tschatzl

     1 /*

     2  * Copyright (c) 1997, 2012, 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"

    27 /////////////// Unit tests ///////////////

    29 #ifndef PRODUCT

    31 #include "oops/arrayOop.hpp"

    32 #include "oops/oop.inline.hpp"

    33 #include "utilities/globalDefinitions.hpp"

    35 bool arrayOopDesc::check_max_length_overflow(BasicType type) {

    36   julong length = max_array_length(type);

    37   julong bytes_per_element = type2aelembytes(type);

    38   julong bytes = length * bytes_per_element + header_size_in_bytes();

    39   return (julong)(size_t)bytes == bytes;

    40 }

    42 void arrayOopDesc::test_max_array_length() {

    43   assert(check_max_length_overflow(T_BOOLEAN), "size_t overflow for boolean array");

    44   assert(check_max_length_overflow(T_CHAR), "size_t overflow for char array");

    45   assert(check_max_length_overflow(T_FLOAT), "size_t overflow for float array");

    46   assert(check_max_length_overflow(T_DOUBLE), "size_t overflow for double array");

    47   assert(check_max_length_overflow(T_BYTE), "size_t overflow for byte array");

    48   assert(check_max_length_overflow(T_SHORT), "size_t overflow for short array");

    49   assert(check_max_length_overflow(T_INT), "size_t overflow for int array");

    50   assert(check_max_length_overflow(T_LONG), "size_t overflow for long array");

    51   assert(check_max_length_overflow(T_OBJECT), "size_t overflow for object array");

    52   assert(check_max_length_overflow(T_ARRAY), "size_t overflow for array array");

    53   assert(check_max_length_overflow(T_NARROWOOP), "size_t overflow for narrowOop array");

    55   // T_VOID and T_ADDRESS are not supported by max_array_length()

    56 }

    59 #endif //PRODUCT

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/arrayOop.cpp@55a0da3d420b

src/share/vm/oops/arrayOop.cpp