/* * 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.
*/
// 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[19]; // 152 bytes
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