jdk8-mips64-public/hotspot: src/share/vm/services/heapDumper.hpp@17c778814856

6811367: Fix code in HeapDumper::dump_heap() to avoid buffer overrun
Summary: Check buffer size before using and use dynamic buffer sizes for subsequent calls.
Reviewed-by: kamg, dholmes

     1 /*

     2  * Copyright (c) 2005, 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 #ifndef SHARE_VM_SERVICES_HEAPDUMPER_HPP

    26 #define SHARE_VM_SERVICES_HEAPDUMPER_HPP

    28 #include "memory/allocation.hpp"

    29 #include "oops/klassOop.hpp"

    30 #include "oops/oop.hpp"

    31 #include "runtime/os.hpp"

    33 // HeapDumper is used to dump the java heap to file in HPROF binary format:

    34 //

    35 //  { HeapDumper dumper(true /* full GC before heap dump */);

    36 //    if (dumper.dump("/export/java.hprof")) {

    37 //      ResourceMark rm;

    38 //      tty->print_cr("Dump failed: %s", dumper.error_as_C_string());

    39 //    } else {

    40 //      // dump succeeded

    41 //    }

    42 //  }

    43 //

    45 class HeapDumper : public StackObj {

    46  private:

    47   char* _error;

    48   bool _print_to_tty;

    49   bool _gc_before_heap_dump;

    50   bool _oome;

    51   elapsedTimer _t;

    53   HeapDumper(bool gc_before_heap_dump, bool print_to_tty, bool oome) :

    54     _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(print_to_tty), _oome(oome) { }

    56   // string representation of error

    57   char* error() const                   { return _error; }

    58   void set_error(char* error);

    60   // indicates if progress messages can be sent to tty

    61   bool print_to_tty() const             { return _print_to_tty; }

    63   // internal timer.

    64   elapsedTimer* timer()                 { return &_t; }

    66   static void dump_heap(bool oome);

    68  public:

    69   HeapDumper(bool gc_before_heap_dump) :

    70     _gc_before_heap_dump(gc_before_heap_dump), _error(NULL), _print_to_tty(false), _oome(false) { }

    72   ~HeapDumper();

    74   // dumps the heap to the specified file, returns 0 if success.

    75   int dump(const char* path);

    77   // returns error message (resource allocated), or NULL if no error

    78   char* error_as_C_string() const;

    80   static void dump_heap()    KERNEL_RETURN;

    82   static void dump_heap_from_oome()    KERNEL_RETURN;

    83 };

    85 #endif // SHARE_VM_SERVICES_HEAPDUMPER_HPP

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

src/share/vm/services/heapDumper.hpp@17c778814856

src/share/vm/services/heapDumper.hpp