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comparison src/share/vm/services/heapDumper.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c6c601a0f2d6
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1 /*
2 * Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // HeapDumper is used to dump the java heap to file in HPROF binary format:
26 //
27 // { HeapDumper dumper(true /* full GC before heap dump */);
28 // if (dumper.dump("/export/java.hprof")) {
29 // ResourceMark rm;
30 // tty->print_cr("Dump failed: %s", dumper.error_as_C_string());
31 // } else {
32 // // dump succeeded
33 // }
34 // }
35 //
36
37 class HeapDumper : public StackObj {
38 private:
39 char* _error;
40 bool _print_to_tty;
41 bool _gc_before_heap_dump;
42 elapsedTimer _t;
43
44 // string representation of error
45 char* error() const { return _error; }
46 void set_error(char* error);
47
48 // indicates if progress messages can be sent to tty
49 bool print_to_tty() const { return _print_to_tty; }
50
51 // internal timer.
52 elapsedTimer* timer() { return &_t; }
53
54 public:
55 HeapDumper(bool gc_before_heap_dump) :
56 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false) { }
57 HeapDumper(bool gc_before_heap_dump, bool print_to_tty) :
58 _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty) { }
59
60 ~HeapDumper();
61
62 // dumps the heap to the specified file, returns 0 if success.
63 int dump(const char* path);
64
65 // returns error message (resource allocated), or NULL if no error
66 char* error_as_C_string() const;
67
68 static void dump_heap() KERNEL_RETURN;
69 };