Mercurial > hg > graal-jvmci-8
view src/share/vm/classfile/classLoaderData.inline.hpp @ 12301:2c022e432e10
8024974: Incorrect use of GC_locker::is_active()
Summary: SymbolTable and StringTable can make calls to GC_locker::is_active() outside a safepoint. This isn't safe because the GC_locker active state (lock count) is only updated at a safepoint and only remains valid as long as _needs_gc is true. However, outside a safepoint_needs_gc can change to false at any time, which makes it impossible to do a correct call to is_active() in that context. In this case these calls can just be removed since the input argument to basic_add() should never be on the heap and so there's no need to check the GC_locker state. This change also adjusts the assert() in is_active() to makes sure all calls to this function are always done under a safepoint.
Reviewed-by: brutisso, dcubed
Contributed-by: per.liden@oracle.com
author | stefank |
---|---|
date | Fri, 20 Sep 2013 10:53:28 +0200 |
parents | 1cb4795305b9 |
children | de6a9e811145 |
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/* * Copyright (c) 2011, 2012, 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 "classfile/classLoaderData.hpp" #include "classfile/javaClasses.hpp" inline ClassLoaderData* ClassLoaderData::class_loader_data_or_null(oop loader) { if (loader == NULL) { return ClassLoaderData::the_null_class_loader_data(); } return java_lang_ClassLoader::loader_data(loader); } inline ClassLoaderData* ClassLoaderData::class_loader_data(oop loader) { ClassLoaderData* loader_data = class_loader_data_or_null(loader); assert(loader_data != NULL, "Must be"); return loader_data; } inline ClassLoaderData *ClassLoaderDataGraph::find_or_create(Handle loader, TRAPS) { assert(loader() != NULL,"Must be a class loader"); // Gets the class loader data out of the java/lang/ClassLoader object, if non-null // it's already in the loader_data, so no need to add ClassLoaderData* loader_data= java_lang_ClassLoader::loader_data(loader()); if (loader_data) { return loader_data; } return ClassLoaderDataGraph::add(loader, false, THREAD); }