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

 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "prims/jvm.h"

 #include "runtime/os.hpp"

 #include "utilities/decoder.hpp"

 #include "utilities/vmError.hpp"

 #if defined(_WINDOWS)

   #include "decoder_windows.hpp"

 #elif defined(__APPLE__)

   #include "decoder_machO.hpp"

 #else

   #include "decoder_elf.hpp"

 #endif

 AbstractDecoder*  Decoder::_shared_decoder = NULL;

 AbstractDecoder*  Decoder::_error_handler_decoder = NULL;

 NullDecoder       Decoder::_do_nothing_decoder;

 Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,

                                 "SharedDecoderLock");

 AbstractDecoder* Decoder::get_shared_instance() {

   assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),

     "Require DecoderLock to enter");

   if (_shared_decoder == NULL) {

     _shared_decoder = create_decoder();

   }

   return _shared_decoder;

 }

 AbstractDecoder* Decoder::get_error_handler_instance() {

   if (_error_handler_decoder == NULL) {

     _error_handler_decoder = create_decoder();

   }

   return _error_handler_decoder;

 }

 AbstractDecoder* Decoder::create_decoder() {

   AbstractDecoder* decoder;

 #if defined(_WINDOWS)

   decoder = new (std::nothrow) WindowsDecoder();

 #elif defined (__APPLE__)

   decoder = new (std::nothrow)MachODecoder();

 #else

   decoder = new (std::nothrow)ElfDecoder();

 #endif

   if (decoder == NULL || decoder->has_error()) {

     if (decoder != NULL) {

       delete decoder;

     }

     decoder = &_do_nothing_decoder;

   }

   return decoder;

 }

 inline bool DecoderLocker::is_first_error_thread() {

   return (os::current_thread_id() == VMError::get_first_error_tid());

 }

 DecoderLocker::DecoderLocker() :

   MutexLockerEx(DecoderLocker::is_first_error_thread() ?

                 NULL : Decoder::shared_decoder_lock(), true) {

   _decoder = is_first_error_thread() ?

     Decoder::get_error_handler_instance() : Decoder::get_shared_instance();

   assert(_decoder != NULL, "null decoder");

 }

 Mutex* Decoder::shared_decoder_lock() {

   assert(_shared_decoder_lock != NULL, "Just check");

   return _shared_decoder_lock;

 }

 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {

   assert(_shared_decoder_lock != NULL, "Just check");

   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;

   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);

   AbstractDecoder* decoder = error_handling_thread ?

     get_error_handler_instance(): get_shared_instance();

   assert(decoder != NULL, "null decoder");

   return decoder->decode(addr, buf, buflen, offset, modulepath);

 }

 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {

   assert(_shared_decoder_lock != NULL, "Just check");

   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;

   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);

   AbstractDecoder* decoder = error_handling_thread ?

     get_error_handler_instance(): get_shared_instance();

   assert(decoder != NULL, "null decoder");

   return decoder->decode(addr, buf, buflen, offset, base);

 }

 bool Decoder::demangle(const char* symbol, char* buf, int buflen) {

   assert(_shared_decoder_lock != NULL, "Just check");

   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;

   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);

   AbstractDecoder* decoder = error_handling_thread ?

     get_error_handler_instance(): get_shared_instance();

   assert(decoder != NULL, "null decoder");

   return decoder->demangle(symbol, buf, buflen);

 }

 bool Decoder::can_decode_C_frame_in_vm() {

   assert(_shared_decoder_lock != NULL, "Just check");

   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;

   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);

   AbstractDecoder* decoder = error_handling_thread ?

     get_error_handler_instance(): get_shared_instance();

   assert(decoder != NULL, "null decoder");

   return decoder->can_decode_C_frame_in_vm();

 }

 /*

  * Shutdown shared decoder and replace it with

  * _do_nothing_decoder. Do nothing with error handler

  * instance, since the JVM is going down.

  */

 void Decoder::shutdown() {

   assert(_shared_decoder_lock != NULL, "Just check");

   MutexLockerEx locker(_shared_decoder_lock, true);

   if (_shared_decoder != NULL &&

     _shared_decoder != &_do_nothing_decoder) {

     delete _shared_decoder;

   }

   _shared_decoder = &_do_nothing_decoder;

 }