hotspot/src/share/vm/utilities/decoder.cpp
author coleenp
Thu, 11 Dec 2014 21:34:43 -0500
changeset 28163 322d55d167be
parent 22872 b6902ee5bc8d
child 31352 a6ab7217b5cc
permissions -rw-r--r--
8047290: Make Mutex::_no_safepoint_check_flag locks verify that this lock never checks for safepoint Summary: Ensure consistent safepoint checking in Mutex/Monitor locking methods. Reviewed-by: dholmes, dcubed, coleenp Contributed-by: max.ockner@oracle.com
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/*
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 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "prims/jvm.h"
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#include "runtime/os.hpp"
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#include "utilities/decoder.hpp"
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#include "utilities/vmError.hpp"
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#if defined(_WINDOWS)
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  #include "decoder_windows.hpp"
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#elif defined(__APPLE__)
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  #include "decoder_machO.hpp"
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#elif defined(AIX)
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  #include "decoder_aix.hpp"
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#else
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  #include "decoder_elf.hpp"
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#endif
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AbstractDecoder*  Decoder::_shared_decoder = NULL;
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AbstractDecoder*  Decoder::_error_handler_decoder = NULL;
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NullDecoder       Decoder::_do_nothing_decoder;
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Mutex*            Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
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                                "SharedDecoderLock",
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                                false,
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                                Monitor::_safepoint_check_never);
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AbstractDecoder* Decoder::get_shared_instance() {
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  assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
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    "Require DecoderLock to enter");
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  if (_shared_decoder == NULL) {
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    _shared_decoder = create_decoder();
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  }
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  return _shared_decoder;
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}
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AbstractDecoder* Decoder::get_error_handler_instance() {
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  if (_error_handler_decoder == NULL) {
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    _error_handler_decoder = create_decoder();
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  }
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  return _error_handler_decoder;
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}
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AbstractDecoder* Decoder::create_decoder() {
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  AbstractDecoder* decoder;
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#if defined(_WINDOWS)
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  decoder = new (std::nothrow) WindowsDecoder();
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#elif defined (__APPLE__)
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  decoder = new (std::nothrow)MachODecoder();
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#elif defined(AIX)
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  decoder = new (std::nothrow)AIXDecoder();
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#else
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  decoder = new (std::nothrow)ElfDecoder();
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#endif
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  if (decoder == NULL || decoder->has_error()) {
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    if (decoder != NULL) {
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      delete decoder;
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    }
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    decoder = &_do_nothing_decoder;
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  }
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  return decoder;
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}
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inline bool DecoderLocker::is_first_error_thread() {
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  return (os::current_thread_id() == VMError::get_first_error_tid());
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}
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DecoderLocker::DecoderLocker() :
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  MutexLockerEx(DecoderLocker::is_first_error_thread() ?
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                NULL : Decoder::shared_decoder_lock(), true) {
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  _decoder = is_first_error_thread() ?
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    Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
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  assert(_decoder != NULL, "null decoder");
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}
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Mutex* Decoder::shared_decoder_lock() {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  return _shared_decoder_lock;
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}
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bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
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  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
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  AbstractDecoder* decoder = error_handling_thread ?
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    get_error_handler_instance(): get_shared_instance();
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  assert(decoder != NULL, "null decoder");
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  return decoder->decode(addr, buf, buflen, offset, modulepath);
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}
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bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
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  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
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  AbstractDecoder* decoder = error_handling_thread ?
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    get_error_handler_instance(): get_shared_instance();
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  assert(decoder != NULL, "null decoder");
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  return decoder->decode(addr, buf, buflen, offset, base);
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}
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bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
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  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
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  AbstractDecoder* decoder = error_handling_thread ?
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    get_error_handler_instance(): get_shared_instance();
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  assert(decoder != NULL, "null decoder");
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  return decoder->demangle(symbol, buf, buflen);
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}
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bool Decoder::can_decode_C_frame_in_vm() {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
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  MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
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  AbstractDecoder* decoder = error_handling_thread ?
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    get_error_handler_instance(): get_shared_instance();
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  assert(decoder != NULL, "null decoder");
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  return decoder->can_decode_C_frame_in_vm();
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}
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/*
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 * Shutdown shared decoder and replace it with
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 * _do_nothing_decoder. Do nothing with error handler
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 * instance, since the JVM is going down.
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 */
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void Decoder::shutdown() {
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  assert(_shared_decoder_lock != NULL, "Just check");
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  MutexLockerEx locker(_shared_decoder_lock, true);
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  if (_shared_decoder != NULL &&
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    _shared_decoder != &_do_nothing_decoder) {
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    delete _shared_decoder;
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  }
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  _shared_decoder = &_do_nothing_decoder;
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}
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