1 /* 2 * Copyright (c) 2015, 2018, 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 { 31 friend class VMStructs; 32 33 private: 34 uintptr_t _start; 35 uintptr_t _end; 36 37 public: 38 ZVirtualMemory(); 39 ZVirtualMemory(uintptr_t start, size_t size); 40 41 bool is_null() const; 42 uintptr_t start() const; 43 uintptr_t end() const; 44 size_t size() const; 45 ZVirtualMemory split(size_t size); 46 void clear(); 47 }; 48 49 class ZVirtualMemoryManager { 50 private: 51 ZMemoryManager _manager; 52 bool _initialized; 53 54 bool reserve(uintptr_t start, size_t size); 55 void nmt_reserve(uintptr_t start, size_t size); 56 57 public: 58 ZVirtualMemoryManager(); 59 60 bool is_initialized() const; 61 62 ZVirtualMemory alloc(size_t size, bool alloc_from_front = false); 63 void free(ZVirtualMemory vmem); 64 }; 65 66 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP