1 /* 2 * Copyright (c) 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 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "gc/shared/fill.hpp" 28 #include "gc/shared/memAllocator.hpp" 29 #include "utilities/copy.hpp" 30 #include "utilities/debug.hpp" 31 32 bool Fill::_disabled; 33 size_t Fill::_extra_header_size; 34 size_t Fill::_min_size; 35 size_t Fill::_max_size; 36 37 size_t Fill::object_header_size() { 38 return oopDesc::header_size() + _extra_header_size; 39 } 40 41 size_t Fill::array_header_size() { 42 return typeArrayOopDesc::header_size(T_INT) + _extra_header_size; 43 } 44 45 size_t Fill::array_max_payload_size() { 46 return (typeArrayOopDesc::max_array_length(T_INT) * sizeof(jint)) / HeapWordSize; 47 } 48 49 size_t Fill::array_length(size_t size) { 50 return (size - array_header_size()) * (HeapWordSize / sizeof(jint)); 51 } 52 53 void Fill::initialize() { 54 _disabled = false; 55 set_extra_header_size(0); 56 } 57 58 void Fill::set_disabled() { 59 _disabled = true; 60 } 61 62 void Fill::set_extra_header_size(size_t extra_header_size) { 63 _extra_header_size = extra_header_size; 64 _min_size = align_object_size(object_header_size()); 65 _max_size = align_object_size(array_header_size() + array_max_payload_size()); 66 } 67 68 void Fill::set_max_size(size_t max_size) { 69 _max_size = max_size; 70 } 71 72 size_t Fill::min_reserve_size() { 73 const size_t object_size = object_header_size(); 74 return (object_size > (size_t)MinObjAlignment) ? align_object_size(object_size) : 0; 75 } 76 77 void Fill::fill_with_object(HeapWord* start) { 78 const size_t size = object_header_size(); 79 ObjAllocator allocator(SystemDictionary::Object_klass(), size); 80 allocator.initialize(start); 81 } 82 83 void Fill::fill_with_array(HeapWord* start, size_t size) { 84 const size_t length = array_length(size); 85 ObjArrayAllocator allocator(Universe::intArrayKlassObj(), size, (int)length, false /* do_zero */); 86 allocator.initialize(start); 87 88 if (ZapFillerObjects) { 89 HeapWord* const payload_start = start + array_header_size(); 90 const size_t payload_size = size - array_header_size(); 91 Copy::fill_to_words(payload_start, payload_size, 0XDEAFBABE); 92 } 93 } 94 95 void Fill::range(HeapWord* start, size_t size) { 96 assert(is_object_aligned(start), "Misaligned start"); 97 assert(is_object_aligned(size), "Misaligned size"); 98 assert(is_object_aligned(min_size()), "Misaligned min size"); 99 assert(is_object_aligned(max_size()), "Misaligned max sizz"); 100 assert(min_size() <= max_size(), "Invalid min/max size"); 101 102 if (_disabled) { 103 return; 104 } 105 106 const size_t min = min_size(); 107 const size_t max = max_size(); 108 109 while (size >= min) { 110 if (size > max) { 111 fill_with_array(start, max); 112 start += max; 113 size -= max; 114 } else if (size > min) { 115 fill_with_array(start, size); 116 break; 117 } else /* if (size == min) */ { 118 fill_with_object(start); 119 break; 120 } 121 } 122 } 123 124 void Fill::range(HeapWord* start, HeapWord* end) { 125 Fill::range(start, pointer_delta(end, start)); 126 }