jdk8-mips64-public/hotspot: src/share/vm/utilities/intHisto.cpp@36c186bcc085

6302804: Hotspot VM dies ungraceful death when C heap is exhausted in various places.
Summary: enhance the error reporting mechanism to help user to fix the problem rather than making it look like a VM error.
Reviewed-by: kvn, kamg

     1 /*

     2  * Copyright (c) 2001, 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

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "utilities/intHisto.hpp"

    28 IntHistogram::IntHistogram(int est, int max) : _max(max), _tot(0) {

    29   assert(0 <= est && est <= max, "Preconditions");

    30   _elements = new (ResourceObj::C_HEAP) GrowableArray<int>(est, true);

    31   guarantee(_elements != NULL, "alloc failure");

    32 }

    34 void IntHistogram::add_entry(int outcome) {

    35   if (outcome > _max) outcome = _max;

    36   int new_count = _elements->at_grow(outcome) + 1;

    37   _elements->at_put(outcome, new_count);

    38   _tot++;

    39 }

    41 int IntHistogram::entries_for_outcome(int outcome) {

    42   return _elements->at_grow(outcome);

    43 }

    45 void IntHistogram::print_on(outputStream* st) const {

    46   double tot_d = (double)_tot;

    47   st->print_cr("Outcome     # of occurrences   %% of occurrences");

    48   st->print_cr("-----------------------------------------------");

    49   for (int i=0; i < _elements->length()-2; i++) {

    50     int cnt = _elements->at(i);

    51     if (cnt != 0) {

    52       st->print_cr("%7d        %10d         %8.4f",

    53                    i, cnt, (double)cnt/tot_d);

    54     }

    55   }

    56   // Does it have any max entries?

    57   if (_elements->length()-1 == _max) {

    58     int cnt = _elements->at(_max);

    59     st->print_cr(">= %4d        %10d         %8.4f",

    60                  _max, cnt, (double)cnt/tot_d);

    61   }

    62   st->print_cr("-----------------------------------------------");

    63   st->print_cr("    All        %10d         %8.4f", _tot, 1.0);

    64 }

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

src/share/vm/utilities/intHisto.cpp@36c186bcc085

src/share/vm/utilities/intHisto.cpp