Mercurial > hg > truffle
view src/share/vm/ci/ciNullObject.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
---|---|
date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | f95d63e2154a |
children |
line wrap: on
line source
/* * Copyright (c) 1999, 2010, 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. * */ #ifndef SHARE_VM_CI_CINULLOBJECT_HPP #define SHARE_VM_CI_CINULLOBJECT_HPP #include "ci/ciClassList.hpp" #include "ci/ciObject.hpp" #include "ci/ciUtilities.hpp" // ciNullObject // // This class represents a null reference in the VM. class ciNullObject : public ciObject { CI_PACKAGE_ACCESS private: ciNullObject() : ciObject() {} const char* type_string() { return "ciNullObject"; } void print_impl(outputStream* st); public: // Is this ciObject a Java Language Object? That is, // is the ciObject an instance or an array bool is_java_object() { return true; } // What kind of ciObject is this? bool is_null_object() const { return true; } bool is_classless() const { return true; } // Get the distinguished instance of this klass. static ciNullObject* make(); }; #endif // SHARE_VM_CI_CINULLOBJECT_HPP