src/share/vm/utilities/decoder.cpp

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   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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "prims/jvm.h"

  27 #include "utilities/decoder.hpp"
  28 
  29 Decoder::decoder_status  Decoder::_decoder_status = Decoder::no_error;
  30 bool                     Decoder::_initialized = false;





  31 
  32 #if !defined(_WINDOWS) && !defined(__APPLE__)



  33 
  34 // Implementation of common functionalities among Solaris and Linux
  35 #include "utilities/elfFile.hpp"


  36 
  37 ElfFile* Decoder::_opened_elf_files = NULL;


  38 
  39 bool Decoder::can_decode_C_frame_in_vm() {
  40   return true;
  41 }






  42 
  43 void Decoder::initialize() {
  44   _initialized = true;
  45 }
  46 
  47 void Decoder::uninitialize() {
  48   if (_opened_elf_files != NULL) {
  49     delete _opened_elf_files;
  50     _opened_elf_files = NULL;
  51   }
  52   _initialized = false;


  53 }
  54 
  55 Decoder::decoder_status Decoder::decode(address addr, const char* filepath, char *buf, int buflen, int *offset) {
  56   if (_decoder_status != no_error) {
  57     return _decoder_status;
  58   }

  59 
  60   ElfFile* file = get_elf_file(filepath);
  61   if (_decoder_status != no_error) {
  62     return _decoder_status;
  63   }
  64 
  65   const char* symbol = file->decode(addr, offset);
  66   if (file->get_status() == out_of_memory) {
  67     _decoder_status = out_of_memory;
  68     return _decoder_status;
  69   } else if (symbol != NULL) {
  70     if (!demangle(symbol, buf, buflen)) {
  71       jio_snprintf(buf, buflen, "%s", symbol);
  72     }
  73     return no_error;
  74   } else {
  75     return symbol_not_found;
  76   }
  77 }
  78 
  79 ElfFile* Decoder::get_elf_file(const char* filepath) {
  80   if (_decoder_status != no_error) {
  81     return NULL;
  82   }
  83   ElfFile* file = _opened_elf_files;
  84   while (file != NULL) {
  85     if (file->same_elf_file(filepath)) {
  86       return file;
  87     }
  88     file = file->m_next;
  89   }
  90 
  91   file = new ElfFile(filepath);
  92   if (file == NULL) {
  93     _decoder_status = out_of_memory;





  94   }
  95   if (_opened_elf_files != NULL) {
  96     file->m_next = _opened_elf_files;
  97   }
  98 
  99   _opened_elf_files = file;
 100   return file;
 101 }
 102 
 103 #endif


   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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "prims/jvm.h"
  27 #include "runtime/mutexLocker.hpp"
  28 #include "utilities/decoder.hpp"
  29 
  30 #if defined(_WINDOWS)
  31   #include "decoder_windows.hpp"
  32 #elif defined(__APPLE__)
  33   #include "decoder_machO.hpp"
  34 #else
  35   #include "decoder_elf.hpp"
  36 #endif
  37 
  38 NullDecoder*  Decoder::_decoder = NULL;
  39 NullDecoder   Decoder::_do_nothing_decoder;
  40 Mutex*           Decoder::_decoder_lock = new Mutex(Mutex::safepoint,
  41                                 "DecoderLock");
  42 
  43 // _decoder_lock should already acquired before enter this method
  44 NullDecoder* Decoder::get_decoder() {
  45   assert(_decoder_lock != NULL && _decoder_lock->owned_by_self(),
  46     "Require DecoderLock to enter");
  47 
  48   if (_decoder != NULL) {
  49     return _decoder;
  50   }
  51 
  52   // Decoder is a secondary service. Although, it is good to have,
  53   // but we can live without it. 
  54 #if defined(_WINDOWS)
  55   _decoder = new (std::nothrow) WindowsDecoder();
  56 #elif defined (__APPLE__) 
  57     _decoder = new (std::nothrow)MachODecoder();
  58 #else
  59     _decoder = new (std::nothrow)ElfDecoder();
  60 #endif
  61 
  62   if (_decoder == NULL || _decoder->has_error()) {
  63     if (_decoder != NULL) {
  64       delete _decoder;





  65     }
  66     _decoder = &_do_nothing_decoder;
  67   }
  68   return _decoder;
  69 }
  70 
  71 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
  72   assert(_decoder_lock != NULL, "Just check");
  73   MutexLockerEx locker(_decoder_lock, true);
  74   NullDecoder* decoder = get_decoder();
  75   assert(decoder != NULL, "null decoder");
  76 
  77   return decoder->decode(addr, buf, buflen, offset, modulepath);
  78 }


  79 
  80 bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
  81   assert(_decoder_lock != NULL, "Just check");
  82   MutexLockerEx locker(_decoder_lock, true);
  83   NullDecoder* decoder = get_decoder();
  84   assert(decoder != NULL, "null decoder");
  85   return decoder->demangle(symbol, buf, buflen);






  86 }
  87 
  88 bool Decoder::can_decode_C_frame_in_vm() {
  89   assert(_decoder_lock != NULL, "Just check");
  90   MutexLockerEx locker(_decoder_lock, true);
  91   NullDecoder* decoder = get_decoder();
  92   assert(decoder != NULL, "null decoder");
  93   return decoder->can_decode_C_frame_in_vm();
  94 }




  95 
  96 // shutdown real decoder and replace it with
  97 // _do_nothing_decoder
  98 void Decoder::shutdown() {
  99   assert(_decoder_lock != NULL, "Just check");
 100   MutexLockerEx locker(_decoder_lock, true);
 101 
 102   if (_decoder != NULL && _decoder != &_do_nothing_decoder) {
 103     delete _decoder;
 104   }



 105 
 106   _decoder = &_do_nothing_decoder;

 107 }