1 /*
2 * Copyright (c) 1997, 2019, 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_OOPS_OBJARRAYOOP_HPP
26 #define SHARE_OOPS_OBJARRAYOOP_HPP
27
28 #include "oops/arrayOop.hpp"
29 #include "utilities/align.hpp"
30
31 class Klass;
32
33 // An objArrayOop is an array containing oops.
34 // Evaluating "String arg[10]" will create an objArrayOop.
35
36 class objArrayOopDesc : public arrayOopDesc {
37 friend class ObjArrayKlass;
38 friend class Runtime1;
39 friend class psPromotionManager;
40 friend class CSetMarkWordClosure;
41 friend class G1ParScanPartialArrayClosure;
42
43 template <class T> T* obj_at_addr(int index) const;
44 template <class T> T* obj_at_addr_raw(int index) const;
45
46 template <class T>
47 static ptrdiff_t obj_at_offset(int index) {
48 return base_offset_in_bytes() + sizeof(T) * index;
49 }
50
51 private:
52 // Give size of objArrayOop in HeapWords minus the header
53 static int array_size(int length) {
54 const uint OopsPerHeapWord = HeapWordSize/heapOopSize;
55 assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),
56 "Else the following (new) computation would be in error");
57 uint res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
58 #ifdef ASSERT
59 // The old code is left in for sanity-checking; it'll
60 // go away pretty soon. XXX
61 // Without UseCompressedOops, this is simply:
|
1 /*
2 * Copyright (c) 1997, 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_OOPS_OBJARRAYOOP_HPP
26 #define SHARE_OOPS_OBJARRAYOOP_HPP
27
28 #include "oops/arrayOop.hpp"
29 #include "utilities/align.hpp"
30
31 class Klass;
32
33 // An objArrayOop is an array containing oops.
34 // Evaluating "String arg[10]" will create an objArrayOop.
35
36 class objArrayOopDesc : public arrayOopDesc {
37 friend class ObjArrayKlass;
38 friend class Runtime1;
39 friend class psPromotionManager;
40 friend class CSetMarkWordClosure;
41
42 template <class T> T* obj_at_addr(int index) const;
43 template <class T> T* obj_at_addr_raw(int index) const;
44
45 template <class T>
46 static ptrdiff_t obj_at_offset(int index) {
47 return base_offset_in_bytes() + sizeof(T) * index;
48 }
49
50 private:
51 // Give size of objArrayOop in HeapWords minus the header
52 static int array_size(int length) {
53 const uint OopsPerHeapWord = HeapWordSize/heapOopSize;
54 assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),
55 "Else the following (new) computation would be in error");
56 uint res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
57 #ifdef ASSERT
58 // The old code is left in for sanity-checking; it'll
59 // go away pretty soon. XXX
60 // Without UseCompressedOops, this is simply:
|