| /* |
| * Copyright (c) 2018, 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_GC_SHARED_GCTHREADLOCALDATA_HPP |
| #define SHARE_GC_SHARED_GCTHREADLOCALDATA_HPP |
| |
| #include "utilities/globalDefinitions.hpp" |
| |
| // Thread local data area for GC-specific information. Each GC |
| // is free to decide the internal structure and contents of this |
| // area. It is represented as a 64-bit aligned opaque blob to |
| // avoid circular dependencies between Thread and all GCs. For |
| // the same reason, the size of the data area is hard coded to |
| // provide enough space for all current GCs. Adjust the size if |
| // needed, but avoid making it excessively large as it adds to |
| // the memory overhead of creating a thread. |
| // |
| // Use Thread::gc_data<T>() to access the data, where T is the |
| // GC-specific type describing the structure of the data. GCs |
| // should consider placing frequently accessed fields first in |
| // T, so that field offsets relative to Thread are small, which |
| // often allows for a more compact instruction encoding. |
| typedef uint64_t GCThreadLocalData[18]; // 144 bytes |
| |
| #endif // SHARE_GC_SHARED_GCTHREADLOCALDATA_HPP |
