1 /*
2 * Copyright (c) 1997, 2012, 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 *
143
144 // Returns the number of words necessary to hold an array of "len"
145 // elements each of the given "byte_size".
146 private:
147 static int object_size(int lh, int length) {
148 int instance_header_size = Klass::layout_helper_header_size(lh);
149 int element_shift = Klass::layout_helper_log2_element_size(lh);
150 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
151 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
152
153 julong size_in_bytes = (juint)length;
154 size_in_bytes <<= element_shift;
155 size_in_bytes += instance_header_size;
156 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
157 assert(size_in_words <= (julong)max_jint, "no overflow");
158
159 return align_object_size((intptr_t)size_in_words);
160 }
161
162 public:
163 int object_size() {
164 TypeArrayKlass* tk = TypeArrayKlass::cast(klass());
165 return object_size(tk->layout_helper(), length());
166 }
167 };
168
169 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP
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1 /*
2 * Copyright (c) 1997, 2016, 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 *
143
144 // Returns the number of words necessary to hold an array of "len"
145 // elements each of the given "byte_size".
146 private:
147 static int object_size(int lh, int length) {
148 int instance_header_size = Klass::layout_helper_header_size(lh);
149 int element_shift = Klass::layout_helper_log2_element_size(lh);
150 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
151 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
152
153 julong size_in_bytes = (juint)length;
154 size_in_bytes <<= element_shift;
155 size_in_bytes += instance_header_size;
156 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
157 assert(size_in_words <= (julong)max_jint, "no overflow");
158
159 return align_object_size((intptr_t)size_in_words);
160 }
161
162 public:
163 int object_size();
164 };
165
166 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP
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