1 /* 2 * Copyright (c) 2015, 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_VM_OOPS_FLATARRAYOOP_HPP 26 #define SHARE_VM_OOPS_FLATARRAYOOP_HPP 27 28 #include "oops/arrayOop.hpp" 29 #include "oops/klass.hpp" 30 #include "runtime/handles.hpp" 31 32 // A flatArrayOop points to a flat array containing inline types (no indirection). 33 // It may include embedded oops in its elements. 34 35 class flatArrayOopDesc : public arrayOopDesc { 36 37 public: 38 void* base() const; 39 void* value_at_addr(int index, jint lh) const; 40 41 // Return a buffered element from index 42 static oop value_alloc_copy_from_index(flatArrayHandle vah, int index, TRAPS); 43 void value_copy_from_index(int index, oop dst) const; 44 void value_copy_to_index(oop src, int index) const; 45 46 // Sizing 47 static size_t element_size(int lh, int nof_elements) { 48 size_t sz = (size_t) nof_elements; 49 return sz << Klass::layout_helper_log2_element_size(lh); 50 } 51 52 static int object_size(int lh, int length) { 53 julong size_in_bytes = base_offset_in_bytes(Klass::layout_helper_element_type(lh)); 54 size_in_bytes += element_size(lh, length); 55 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize); 56 assert(size_in_words <= (julong)max_jint, "no overflow"); 57 return align_object_size((intptr_t)size_in_words); 58 } 59 60 int object_size() const; 61 62 }; 63 64 #endif // SHARE_VM_OOPS_FLATARRAYOOP_HPP