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annotate src/share/vm/services/heapDumper.hpp @ 1775:30f67acf635d

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6765718: Indicate which thread throwing OOME when generating the heap dump at OOME Summary: Emit a fake frame that makes it look like the thread is in the OutOfMemoryError zero-parameter constructor Reviewed-by: dcubed
author thurka
date Sat, 11 Sep 2010 08:18:31 +0200
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 // HeapDumper is used to dump the java heap to file in HPROF binary format:
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26 //
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27 // { HeapDumper dumper(true /* full GC before heap dump */);
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28 // if (dumper.dump("/export/java.hprof")) {
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29 // ResourceMark rm;
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30 // tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
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31 // } else {
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32 // // dump succeeded
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33 // }
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34 // }
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35 //
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36
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37 class HeapDumper : public StackObj {
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38 private:
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39 char* _error;
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40 bool _print_to_tty;
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41 bool _gc_before_heap_dump;
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42 bool _oome;
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43 elapsedTimer _t;
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44
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45 HeapDumper(bool gc_before_heap_dump, bool print_to_tty, bool oome) :
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46 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty), _oome(oome) { }
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47
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48 // string representation of error
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49 char* error() const { return _error; }
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50 void set_error(char* error);
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51
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52 // indicates if progress messages can be sent to tty
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53 bool print_to_tty() const { return _print_to_tty; }
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54
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55 // internal timer.
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56 elapsedTimer* timer() { return &_t; }
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57
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58 static void dump_heap(bool oome);
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59
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60 public:
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61 HeapDumper(bool gc_before_heap_dump) :
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62 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false), _oome(false) { }
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64 ~HeapDumper();
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65
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66 // dumps the heap to the specified file, returns 0 if success.
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67 int dump(const char* path);
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68
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69 // returns error message (resource allocated), or NULL if no error
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70 char* error_as_C_string() const;
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71
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72 static void dump_heap() KERNEL_RETURN;
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73
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74 static void dump_heap_from_oome() KERNEL_RETURN;
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75 };