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
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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 is an array containing inline types (may include flatten embedded oop elements).
33 
34 class flatArrayOopDesc : public arrayOopDesc {
35 
36  public:
37   void*  base() const;
38   void* value_at_addr(int index, jint lh) const;
39 
40   // Return a buffered element from index
41   static oop value_alloc_copy_from_index(flatArrayHandle vah, int index, TRAPS);
42   void value_copy_from_index(int index, oop dst) const;
43   void value_copy_to_index(oop src, int index) const;
44 
45   // Sizing
46   static size_t element_size(int lh, int nof_elements) {
47     size_t sz = (size_t) nof_elements;
48     return sz << Klass::layout_helper_log2_element_size(lh);
49   }
50 
51   static int object_size(int lh, int length) {
52     julong size_in_bytes = header_size_in_bytes() + element_size(lh, length);
53     julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
54     assert(size_in_words <= (julong)max_jint, "no overflow");
55     return align_object_size((intptr_t)size_in_words);
56   }
57 
58   int object_size() const;
59 
60 };
61 
62 #endif // SHARE_VM_OOPS_FLATARRAYOOP_HPP