1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_UTILITIES_VALUEOBJARRAY_HPP 26 #define SHARE_UTILITIES_VALUEOBJARRAY_HPP 27 28 #include "utilities/debug.hpp" 29 30 // Stamps out Count instances of Type using a recursive template. 31 template <typename Type, int Count> 32 class ValueObjBlock { 33 typedef ValueObjBlock<Type, Count - 1> Next; 34 35 Type _instance; 36 Next _next; 37 38 public: 39 template <typename Generator> 40 ValueObjBlock(Generator g, Type** save_to) : 41 _instance(*g), 42 _next(++g, save_to + 1) { 43 *save_to = &_instance; 44 } 45 }; 46 47 // Specialization for the recursion base case. 48 template <typename Type> 49 class ValueObjBlock<Type, 0> { 50 public: 51 template <typename Generator> 52 ValueObjBlock(Generator, Type**) {} 53 }; 54 55 // Maps an array of size Count over stamped-out instances of Type. 56 template <typename Type, int Count> 57 struct ValueObjArray { 58 Type* _ptrs[Count]; 59 ValueObjBlock<Type, Count> _block; 60 61 template <typename Generator> 62 ValueObjArray(Generator g) : _ptrs(), _block(g, _ptrs) {} 63 64 Type* at(int index) const { 65 assert(0 <= index && index < Count, "index out-of-bounds: %d", index); 66 return _ptrs[index]; 67 } 68 69 static int count() { 70 return Count; 71 } 72 }; 73 74 #endif // SHARE_UTILITIES_VALUEOBJARRAY_HPP