1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef SHARE_GC_SHARED_GCARGUMENTS_HPP 27 #define SHARE_GC_SHARED_GCARGUMENTS_HPP 28 29 #include "memory/allocation.hpp" 30 31 class CollectedHeap; 32 33 extern size_t HeapAlignment; 34 extern size_t SpaceAlignment; 35 36 class GCArguments { 37 protected: 38 // Initialize HeapAlignment, SpaceAlignment, and extra alignments (E.g. GenAlignment) 39 virtual void initialize_alignments() = 0; 40 virtual void initialize_heap_flags_and_sizes(); 41 virtual void initialize_size_info(); 42 43 DEBUG_ONLY(void assert_flags();) 44 DEBUG_ONLY(void assert_size_info();) 45 46 public: 47 virtual void initialize(); 48 virtual size_t conservative_max_heap_alignment() = 0; 49 virtual CollectedHeap* create_heap() = 0; 50 51 // Allows GCs to tell external code if it's supported or not in the current setup. 52 virtual bool is_supported() const { 53 return true; 54 } 55 56 void initialize_heap_sizes(); 57 58 static size_t compute_heap_alignment(); 59 60 static bool check_args_consistency(); 61 }; 62 63 #endif // SHARE_GC_SHARED_GCARGUMENTS_HPP