aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "prims/jvm.h"
aoqi@0: #include "runtime/os.hpp"
aoqi@0: #include "utilities/decoder.hpp"
aoqi@0: #include "utilities/vmError.hpp"
aoqi@0: 
aoqi@0: #if defined(_WINDOWS)
aoqi@0:   #include "decoder_windows.hpp"
aoqi@0: #elif defined(__APPLE__)
aoqi@0:   #include "decoder_machO.hpp"
aoqi@0: #elif defined(AIX)
aoqi@0:   #include "decoder_aix.hpp"
aoqi@0: #else
aoqi@0:   #include "decoder_elf.hpp"
aoqi@0: #endif
aoqi@0: 
aoqi@0: AbstractDecoder*  Decoder::_shared_decoder = NULL;
aoqi@0: AbstractDecoder*  Decoder::_error_handler_decoder = NULL;
aoqi@0: NullDecoder       Decoder::_do_nothing_decoder;
aoqi@0: Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
aoqi@0:                                 "SharedDecoderLock");
aoqi@0: 
aoqi@0: AbstractDecoder* Decoder::get_shared_instance() {
aoqi@0:   assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
aoqi@0:     "Require DecoderLock to enter");
aoqi@0: 
aoqi@0:   if (_shared_decoder == NULL) {
aoqi@0:     _shared_decoder = create_decoder();
aoqi@0:   }
aoqi@0:   return _shared_decoder;
aoqi@0: }
aoqi@0: 
aoqi@0: AbstractDecoder* Decoder::get_error_handler_instance() {
aoqi@0:   if (_error_handler_decoder == NULL) {
aoqi@0:     _error_handler_decoder = create_decoder();
aoqi@0:   }
aoqi@0:   return _error_handler_decoder;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: AbstractDecoder* Decoder::create_decoder() {
aoqi@0:   AbstractDecoder* decoder;
aoqi@0: #if defined(_WINDOWS)
aoqi@0:   decoder = new (std::nothrow) WindowsDecoder();
aoqi@0: #elif defined (__APPLE__)
aoqi@0:   decoder = new (std::nothrow)MachODecoder();
aoqi@0: #elif defined(AIX)
aoqi@0:   decoder = new (std::nothrow)AIXDecoder();
aoqi@0: #else
aoqi@0:   decoder = new (std::nothrow)ElfDecoder();
aoqi@0: #endif
aoqi@0: 
aoqi@0:   if (decoder == NULL || decoder->has_error()) {
aoqi@0:     if (decoder != NULL) {
aoqi@0:       delete decoder;
aoqi@0:     }
aoqi@0:     decoder = &_do_nothing_decoder;
aoqi@0:   }
aoqi@0:   return decoder;
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool DecoderLocker::is_first_error_thread() {
aoqi@0:   return (os::current_thread_id() == VMError::get_first_error_tid());
aoqi@0: }
aoqi@0: 
aoqi@0: DecoderLocker::DecoderLocker() :
aoqi@0:   MutexLockerEx(DecoderLocker::is_first_error_thread() ?
aoqi@0:                 NULL : Decoder::shared_decoder_lock(), true) {
aoqi@0:   _decoder = is_first_error_thread() ?
aoqi@0:     Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
aoqi@0:   assert(_decoder != NULL, "null decoder");
aoqi@0: }
aoqi@0: 
aoqi@0: Mutex* Decoder::shared_decoder_lock() {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   return _shared_decoder_lock;
aoqi@0: }
aoqi@0: 
aoqi@0: bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0:   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0:   AbstractDecoder* decoder = error_handling_thread ?
aoqi@0:     get_error_handler_instance(): get_shared_instance();
aoqi@0:   assert(decoder != NULL, "null decoder");
aoqi@0: 
aoqi@0:   return decoder->decode(addr, buf, buflen, offset, modulepath);
aoqi@0: }
aoqi@0: 
aoqi@0: bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0:   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0:   AbstractDecoder* decoder = error_handling_thread ?
aoqi@0:     get_error_handler_instance(): get_shared_instance();
aoqi@0:   assert(decoder != NULL, "null decoder");
aoqi@0: 
aoqi@0:   return decoder->decode(addr, buf, buflen, offset, base);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0:   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0:   AbstractDecoder* decoder = error_handling_thread ?
aoqi@0:     get_error_handler_instance(): get_shared_instance();
aoqi@0:   assert(decoder != NULL, "null decoder");
aoqi@0:   return decoder->demangle(symbol, buf, buflen);
aoqi@0: }
aoqi@0: 
aoqi@0: bool Decoder::can_decode_C_frame_in_vm() {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0:   MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0:   AbstractDecoder* decoder = error_handling_thread ?
aoqi@0:     get_error_handler_instance(): get_shared_instance();
aoqi@0:   assert(decoder != NULL, "null decoder");
aoqi@0:   return decoder->can_decode_C_frame_in_vm();
aoqi@0: }
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Shutdown shared decoder and replace it with
aoqi@0:  * _do_nothing_decoder. Do nothing with error handler
aoqi@0:  * instance, since the JVM is going down.
aoqi@0:  */
aoqi@0: void Decoder::shutdown() {
aoqi@0:   assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0:   MutexLockerEx locker(_shared_decoder_lock, true);
aoqi@0: 
aoqi@0:   if (_shared_decoder != NULL &&
aoqi@0:     _shared_decoder != &_do_nothing_decoder) {
aoqi@0:     delete _shared_decoder;
aoqi@0:   }
aoqi@0: 
aoqi@0:   _shared_decoder = &_do_nothing_decoder;
aoqi@0: }
aoqi@0: