| /* | |
| * Copyright (c) 2018, 2023, 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 | |
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| */ | |
| #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[43]; // 344 bytes | |
| #endif // SHARE_GC_SHARED_GCTHREADLOCALDATA_HPP |