1 /*
2 * Copyright (c) 2000, 2023, 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 *
38 friend class ArchiveBuilder;
39 friend class MetadataFactory;
40 friend class VMStructs;
41 friend class JVMCIVMStructs;
42 friend class MethodHandleCompiler; // special case
43 friend class WhiteBox;
44 friend class FieldInfoStream;
45 protected:
46 int _length; // the number of array elements
47 T _data[1]; // the array memory
48
49 void initialize(int length) {
50 _length = length;
51 }
52
53 private:
54 NONCOPYABLE(Array);
55
56 inline void* operator new(size_t size, ClassLoaderData* loader_data, int length, TRAPS) throw();
57
58 static size_t byte_sizeof(int length, size_t elm_byte_size) {
59 return sizeof(Array<T>) + MAX2(length - 1, 0) * elm_byte_size;
60 }
61 static size_t byte_sizeof(int length) { return byte_sizeof(length, sizeof(T)); }
62
63 // WhiteBox API helper.
64 // Can't distinguish between array of length 0 and length 1,
65 // will always return 0 in those cases.
66 static int bytes_to_length(size_t bytes) {
67 assert(is_aligned(bytes, BytesPerWord), "Must be, for now");
68
69 if (sizeof(Array<T>) >= bytes) {
70 return 0;
71 }
72
73 size_t left = bytes - sizeof(Array<T>);
74 assert(is_aligned(left, sizeof(T)), "Must be");
75
76 size_t elements = left / sizeof(T);
77 assert(elements <= (size_t)INT_MAX, "number of elements " SIZE_FORMAT "doesn't fit into an int.", elements);
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1 /*
2 * Copyright (c) 2000, 2024, 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 *
38 friend class ArchiveBuilder;
39 friend class MetadataFactory;
40 friend class VMStructs;
41 friend class JVMCIVMStructs;
42 friend class MethodHandleCompiler; // special case
43 friend class WhiteBox;
44 friend class FieldInfoStream;
45 protected:
46 int _length; // the number of array elements
47 T _data[1]; // the array memory
48
49 void initialize(int length) {
50 _length = length;
51 }
52
53 private:
54 NONCOPYABLE(Array);
55
56 inline void* operator new(size_t size, ClassLoaderData* loader_data, int length, TRAPS) throw();
57
58 inline void* operator new(size_t size, ClassLoaderData* loader_data, int length) throw();
59
60 // Work-around -- see JDK-8331086
61 inline void* operator new(size_t size, int length, MEMFLAGS flags) throw();
62
63 static size_t byte_sizeof(int length, size_t elm_byte_size) {
64 return sizeof(Array<T>) + MAX2(length - 1, 0) * elm_byte_size;
65 }
66 static size_t byte_sizeof(int length) { return byte_sizeof(length, sizeof(T)); }
67
68 // WhiteBox API helper.
69 // Can't distinguish between array of length 0 and length 1,
70 // will always return 0 in those cases.
71 static int bytes_to_length(size_t bytes) {
72 assert(is_aligned(bytes, BytesPerWord), "Must be, for now");
73
74 if (sizeof(Array<T>) >= bytes) {
75 return 0;
76 }
77
78 size_t left = bytes - sizeof(Array<T>);
79 assert(is_aligned(left, sizeof(T)), "Must be");
80
81 size_t elements = left / sizeof(T);
82 assert(elements <= (size_t)INT_MAX, "number of elements " SIZE_FORMAT "doesn't fit into an int.", elements);
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