jdk8-mips64-public/hotspot: src/share/vm/memory/memRegion.cpp@746b070f5022

8011661: Insufficient memory message says "malloc" when sometimes it should say "mmap"
Reviewed-by: coleenp, zgu, hseigel

     1 /*

     2  * Copyright (c) 2000, 2010, 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 "memory/memRegion.hpp"

    27 #include "runtime/globals.hpp"

    29 // A very simple data structure representing a contigous word-aligned

    30 // region of address space.

    32 MemRegion MemRegion::intersection(const MemRegion mr2) const {

    33   MemRegion res;

    34   HeapWord* res_start = MAX2(start(), mr2.start());

    35   HeapWord* res_end   = MIN2(end(),   mr2.end());

    36   if (res_start < res_end) {

    37     res.set_start(res_start);

    38     res.set_end(res_end);

    39   }

    40   return res;

    41 }

    43 MemRegion MemRegion::_union(const MemRegion mr2) const {

    44   // If one region is empty, return the other

    45   if (is_empty()) return mr2;

    46   if (mr2.is_empty()) return MemRegion(start(), end());

    48   // Otherwise, regions must overlap or be adjacent

    49   assert(((start() <= mr2.start()) && (end() >= mr2.start())) ||

    50          ((mr2.start() <= start()) && (mr2.end() >= start())),

    51              "non-adjacent or overlapping regions");

    52   MemRegion res;

    53   HeapWord* res_start = MIN2(start(), mr2.start());

    54   HeapWord* res_end   = MAX2(end(),   mr2.end());

    55   res.set_start(res_start);

    56   res.set_end(res_end);

    57   return res;

    58 }

    60 MemRegion MemRegion::minus(const MemRegion mr2) const {

    61   // There seem to be 6 cases:

    62   //                  |this MemRegion|

    63   // |strictly below|

    64   //   |overlap beginning|

    65   //                    |interior|

    66   //                        |overlap ending|

    67   //                                   |strictly above|

    68   //              |completely overlapping|

    69   // We can't deal with an interior case because it would

    70   // produce two disjoint regions as a result.

    71   // We aren't trying to be optimal in the number of tests below,

    72   // but the order is important to distinguish the strictly cases

    73   // from the overlapping cases.

    74   if (mr2.end() <= start()) {

    75     // strictly below

    76     return MemRegion(start(), end());

    77   }

    78   if (mr2.start() <= start() && mr2.end() <= end()) {

    79     // overlap beginning

    80     return MemRegion(mr2.end(), end());

    81   }

    82   if (mr2.start() >= end()) {

    83     // strictly above

    84     return MemRegion(start(), end());

    85   }

    86   if (mr2.start() >= start() && mr2.end() >= end()) {

    87     // overlap ending

    88     return MemRegion(start(), mr2.start());

    89   }

    90   if (mr2.start() <= start() && mr2.end() >= end()) {

    91     // completely overlapping

    92     return MemRegion();

    93   }

    94   if (mr2.start() > start() && mr2.end() < end()) {

    95     // interior

    96     guarantee(false, "MemRegion::minus, but interior");

    97     return MemRegion();

    98   }

    99   ShouldNotReachHere();

   100   return MemRegion();

   101 }

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