1 /*
 2  * Copyright (c) 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.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
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24  */
25 
26 package jdk.internal.foreign;
27 
28 import java.lang.foreign.Arena;
29 import java.lang.foreign.MemorySegment;
30 import java.lang.foreign.MemorySegment.Scope;
31 
32 public final class ArenaImpl implements Arena {
33 
34     private final MemorySessionImpl session;
35     private final boolean shouldReserveMemory;
36     ArenaImpl(MemorySessionImpl session) {
37         this.session = session;
38         shouldReserveMemory = session instanceof ImplicitSession;
39     }
40 
41     @Override
42     public Scope scope() {
43         return session;
44     }
45 
46     @Override
47     public void close() {
48         session.close();
49     }
50 
51     public MemorySegment allocateNoInit(long byteSize, long byteAlignment) {
52         Utils.checkAllocationSizeAndAlign(byteSize, byteAlignment);
53         return NativeMemorySegmentImpl.makeNativeSegment(byteSize, byteAlignment, session, shouldReserveMemory);
54     }
55 
56     @Override
57     public MemorySegment allocate(long byteSize, long byteAlignment) {
58         MemorySegment segment = allocateNoInit(byteSize, byteAlignment);
59         return segment.fill((byte)0);
60     }
61 }