1 /* 2 * Copyright (c) 2015, 2017, 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 #ifndef SHARE_GC_Z_ZVIRTUALMEMORY_HPP 25 #define SHARE_GC_Z_ZVIRTUALMEMORY_HPP 26 27 #include "gc/z/zMemory.hpp" 28 #include "memory/allocation.hpp" 29 30 class ZVirtualMemory VALUE_OBJ_CLASS_SPEC { 31 private: 32 uintptr_t _start; 33 uintptr_t _end; 34 35 public: 36 ZVirtualMemory(); 37 ZVirtualMemory(uintptr_t start, size_t size); 38 39 bool is_null() const; 40 uintptr_t start() const; 41 uintptr_t end() const; 42 size_t size() const; 43 ZVirtualMemory split(size_t size); 44 void clear(); 45 }; 46 47 class ZVirtualMemoryManager VALUE_OBJ_CLASS_SPEC { 48 private: 49 ZMemoryManager _manager; 50 bool _initialized; 51 52 bool reserve(uintptr_t start, size_t size); 53 void nmt_reserve(uintptr_t start, size_t size); 54 55 public: 56 ZVirtualMemoryManager(); 57 58 bool is_initialized() const; 59 60 ZVirtualMemory alloc(size_t size, bool alloc_from_front = false); 61 void free(ZVirtualMemory vmem); 62 }; 63 64 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP