jdk8-mips64-public/hotspot: src/share/vm/utilities/decoder.hpp@d2a62e0f25eb

6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain

     1 /*

     2  * Copyright (c) 1997, 2012, 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  */

    26 #ifndef SHARE_VM_UTILITIES_DECODER_HPP

    27 #define SHARE_VM_UTILITIES_DECODER_HPP

    29 #include "memory/allocation.hpp"

    30 #include "runtime/mutex.hpp"

    32 class AbstractDecoder : public CHeapObj<mtInternal> {

    33 public:

    34   // status code for decoding native C frame

    35   enum decoder_status {

    36          not_available = -10,  // real decoder is not available

    37          no_error = 0,         // successfully decoded frames

    38          out_of_memory,        // out of memory

    39          file_invalid,         // invalid elf file

    40          file_not_found,       // could not found symbol file (on windows), such as jvm.pdb or jvm.map

    41          helper_not_found,     // could not load dbghelp.dll (Windows only)

    42          helper_func_error,    // decoding functions not found (Windows only)

    43          helper_init_error     // SymInitialize failed (Windows only)

    44   };

    46   // decode an pc address to corresponding function name and an offset from the beginning of

    47   // the function

    48   virtual bool decode(address pc, char* buf, int buflen, int* offset,

    49     const char* modulepath = NULL) = 0;

    50   // demangle a C++ symbol

    51   virtual bool demangle(const char* symbol, char* buf, int buflen) = 0;

    52   // if the decoder can decode symbols in vm

    53   virtual bool can_decode_C_frame_in_vm() const = 0;

    55   virtual decoder_status status() const {

    56     return _decoder_status;

    57   }

    59   virtual bool has_error() const {

    60     return is_error(_decoder_status);

    61   }

    63   static bool is_error(decoder_status status) {

    64     return (status > 0);

    65   }

    67 protected:

    68   decoder_status  _decoder_status;

    69 };

    71 // Do nothing decoder

    72 class NullDecoder : public AbstractDecoder {

    73 public:

    74   NullDecoder() {

    75     _decoder_status = not_available;

    76   }

    78   ~NullDecoder() {};

    80   virtual bool decode(address pc, char* buf, int buflen, int* offset,

    81     const char* modulepath = NULL) {

    82     return false;

    83   }

    85   virtual bool demangle(const char* symbol, char* buf, int buflen) {

    86     return false;

    87   }

    89   virtual bool can_decode_C_frame_in_vm() const {

    90     return false;

    91   }

    92 };

    95 class Decoder : AllStatic {

    96 public:

    97   static bool decode(address pc, char* buf, int buflen, int* offset, const char* modulepath = NULL);

    98   static bool demangle(const char* symbol, char* buf, int buflen);

    99   static bool can_decode_C_frame_in_vm();

   101   // shutdown shared instance

   102   static void shutdown();

   103 protected:

   104   // shared decoder instance, _shared_instance_lock is needed

   105   static AbstractDecoder* get_shared_instance();

   106   // a private instance for error handler. Error handler can be

   107   // triggered almost everywhere, including signal handler, where

   108   // no lock can be taken. So the shared decoder can not be used

   109   // in this scenario.

   110   static AbstractDecoder* get_error_handler_instance();

   112   static AbstractDecoder* create_decoder();

   113 private:

   114   static AbstractDecoder*     _shared_decoder;

   115   static AbstractDecoder*     _error_handler_decoder;

   116   static NullDecoder          _do_nothing_decoder;

   118 protected:

   119   static Mutex*               _shared_decoder_lock;

   120 };

   122 #endif // SHARE_VM_UTILITIES_DECODER_HPP

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

src/share/vm/utilities/decoder.hpp@d2a62e0f25eb

src/share/vm/utilities/decoder.hpp