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src/share/vm/utilities/decoder.cpp@f90c822e73f8 (annotated)

src/share/vm/utilities/decoder.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "prims/jvm.h"
aoqi@0	27	#include "runtime/os.hpp"
aoqi@0	28	#include "utilities/decoder.hpp"
aoqi@0	29	#include "utilities/vmError.hpp"
aoqi@0	30
aoqi@0	31	#if defined(_WINDOWS)
aoqi@0	32	#include "decoder_windows.hpp"
aoqi@0	33	#elif defined(__APPLE__)
aoqi@0	34	#include "decoder_machO.hpp"
aoqi@0	35	#elif defined(AIX)
aoqi@0	36	#include "decoder_aix.hpp"
aoqi@0	37	#else
aoqi@0	38	#include "decoder_elf.hpp"
aoqi@0	39	#endif
aoqi@0	40
aoqi@0	41	AbstractDecoder* Decoder::_shared_decoder = NULL;
aoqi@0	42	AbstractDecoder* Decoder::_error_handler_decoder = NULL;
aoqi@0	43	NullDecoder Decoder::_do_nothing_decoder;
aoqi@0	44	Mutex* Decoder::_shared_decoder_lock = new Mutex(Mutex::native,
aoqi@0	45	"SharedDecoderLock");
aoqi@0	46
aoqi@0	47	AbstractDecoder* Decoder::get_shared_instance() {
aoqi@0	48	assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(),
aoqi@0	49	"Require DecoderLock to enter");
aoqi@0	50
aoqi@0	51	if (_shared_decoder == NULL) {
aoqi@0	52	_shared_decoder = create_decoder();
aoqi@0	53	}
aoqi@0	54	return _shared_decoder;
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	AbstractDecoder* Decoder::get_error_handler_instance() {
aoqi@0	58	if (_error_handler_decoder == NULL) {
aoqi@0	59	_error_handler_decoder = create_decoder();
aoqi@0	60	}
aoqi@0	61	return _error_handler_decoder;
aoqi@0	62	}
aoqi@0	63
aoqi@0	64
aoqi@0	65	AbstractDecoder* Decoder::create_decoder() {
aoqi@0	66	AbstractDecoder* decoder;
aoqi@0	67	#if defined(_WINDOWS)
aoqi@0	68	decoder = new (std::nothrow) WindowsDecoder();
aoqi@0	69	#elif defined (__APPLE__)
aoqi@0	70	decoder = new (std::nothrow)MachODecoder();
aoqi@0	71	#elif defined(AIX)
aoqi@0	72	decoder = new (std::nothrow)AIXDecoder();
aoqi@0	73	#else
aoqi@0	74	decoder = new (std::nothrow)ElfDecoder();
aoqi@0	75	#endif
aoqi@0	76
aoqi@0	77	if (decoder == NULL || decoder->has_error()) {
aoqi@0	78	if (decoder != NULL) {
aoqi@0	79	delete decoder;
aoqi@0	80	}
aoqi@0	81	decoder = &_do_nothing_decoder;
aoqi@0	82	}
aoqi@0	83	return decoder;
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	inline bool DecoderLocker::is_first_error_thread() {
aoqi@0	87	return (os::current_thread_id() == VMError::get_first_error_tid());
aoqi@0	88	}
aoqi@0	89
aoqi@0	90	DecoderLocker::DecoderLocker() :
aoqi@0	91	MutexLockerEx(DecoderLocker::is_first_error_thread() ?
aoqi@0	92	NULL : Decoder::shared_decoder_lock(), true) {
aoqi@0	93	_decoder = is_first_error_thread() ?
aoqi@0	94	Decoder::get_error_handler_instance() : Decoder::get_shared_instance();
aoqi@0	95	assert(_decoder != NULL, "null decoder");
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	Mutex* Decoder::shared_decoder_lock() {
aoqi@0	99	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	100	return _shared_decoder_lock;
aoqi@0	101	}
aoqi@0	102
aoqi@0	103	bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
aoqi@0	104	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	105	bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0	106	MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0	107	AbstractDecoder* decoder = error_handling_thread ?
aoqi@0	108	get_error_handler_instance(): get_shared_instance();
aoqi@0	109	assert(decoder != NULL, "null decoder");
aoqi@0	110
aoqi@0	111	return decoder->decode(addr, buf, buflen, offset, modulepath);
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) {
aoqi@0	115	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	116	bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0	117	MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0	118	AbstractDecoder* decoder = error_handling_thread ?
aoqi@0	119	get_error_handler_instance(): get_shared_instance();
aoqi@0	120	assert(decoder != NULL, "null decoder");
aoqi@0	121
aoqi@0	122	return decoder->decode(addr, buf, buflen, offset, base);
aoqi@0	123	}
aoqi@0	124
aoqi@0	125
aoqi@0	126	bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
aoqi@0	127	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	128	bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0	129	MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0	130	AbstractDecoder* decoder = error_handling_thread ?
aoqi@0	131	get_error_handler_instance(): get_shared_instance();
aoqi@0	132	assert(decoder != NULL, "null decoder");
aoqi@0	133	return decoder->demangle(symbol, buf, buflen);
aoqi@0	134	}
aoqi@0	135
aoqi@0	136	bool Decoder::can_decode_C_frame_in_vm() {
aoqi@0	137	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	138	bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid;
aoqi@0	139	MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true);
aoqi@0	140	AbstractDecoder* decoder = error_handling_thread ?
aoqi@0	141	get_error_handler_instance(): get_shared_instance();
aoqi@0	142	assert(decoder != NULL, "null decoder");
aoqi@0	143	return decoder->can_decode_C_frame_in_vm();
aoqi@0	144	}
aoqi@0	145
aoqi@0	146	/*
aoqi@0	147	* Shutdown shared decoder and replace it with
aoqi@0	148	* _do_nothing_decoder. Do nothing with error handler
aoqi@0	149	* instance, since the JVM is going down.
aoqi@0	150	*/
aoqi@0	151	void Decoder::shutdown() {
aoqi@0	152	assert(_shared_decoder_lock != NULL, "Just check");
aoqi@0	153	MutexLockerEx locker(_shared_decoder_lock, true);
aoqi@0	154
aoqi@0	155	if (_shared_decoder != NULL &&
aoqi@0	156	_shared_decoder != &_do_nothing_decoder) {
aoqi@0	157	delete _shared_decoder;
aoqi@0	158	}
aoqi@0	159
aoqi@0	160	_shared_decoder = &_do_nothing_decoder;
aoqi@0	161	}
aoqi@0	162