jdk8-mips64-public/hotspot: src/share/vm/utilities/preserveException.cpp@c96030fff130

6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa

     1 /*

     2  * Copyright 1998-2006 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_preserveException.cpp.incl"

    28 // TODO: These three classes should be refactored

    30 PreserveExceptionMark::PreserveExceptionMark(Thread*& thread) {

    31   thread     = Thread::current();

    32   _thread    = thread;

    33   _preserved_exception_oop = Handle(thread, _thread->pending_exception());

    34   _thread->clear_pending_exception(); // Needed to avoid infinite recursion

    35   _preserved_exception_line = _thread->exception_line();

    36   _preserved_exception_file = _thread->exception_file();

    37 }

    40 PreserveExceptionMark::~PreserveExceptionMark() {

    41   if (_thread->has_pending_exception()) {

    42     oop exception = _thread->pending_exception();

    43     _thread->clear_pending_exception(); // Needed to avoid infinite recursion

    44     exception->print();

    45     fatal("PreserveExceptionMark destructor expects no pending exceptions");

    46   }

    47   if (_preserved_exception_oop() != NULL) {

    48     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

    49   }

    50 }

    53 // This code is cloned from PreserveExceptionMark, except that:

    54 //   returned pending exceptions do not cause a crash.

    55 //   thread is passed in, not set (not a reference parameter)

    56 //   and bug 6431341 has been addressed.

    58 CautiouslyPreserveExceptionMark::CautiouslyPreserveExceptionMark(Thread* thread) {

    59   _thread    = thread;

    60   _preserved_exception_oop = Handle(thread, _thread->pending_exception());

    61   _preserved_exception_line = _thread->exception_line();

    62   _preserved_exception_file = _thread->exception_file();

    63   _thread->clear_pending_exception(); // Pending exceptions are checked in the destructor

    64 }

    67 CautiouslyPreserveExceptionMark::~CautiouslyPreserveExceptionMark() {

    68   assert(!_thread->has_pending_exception(), "unexpected exception generated");

    69   if (_thread->has_pending_exception()) {

    70     _thread->clear_pending_exception();

    71   }

    72   if (_preserved_exception_oop() != NULL) {

    73     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

    74   }

    75 }

    78 void WeakPreserveExceptionMark::preserve() {

    79   _preserved_exception_oop = Handle(_thread, _thread->pending_exception());

    80   _preserved_exception_line = _thread->exception_line();

    81   _preserved_exception_file = _thread->exception_file();

    82   _thread->clear_pending_exception();

    83 }

    85 void WeakPreserveExceptionMark::restore() {

    86   if (!_thread->has_pending_exception()) {

    87     _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

    88   }

    89 }

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

src/share/vm/utilities/preserveException.cpp@c96030fff130

src/share/vm/utilities/preserveException.cpp