1 /*
 2  *  Copyright (c) 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 /*
26  * @test
27  * @bug 8248421
28  * @summary SystemCLinker should have a way to free memory allocated outside Java
29  * @run testng/othervm --enable-native-access=ALL-UNNAMED TestFree
30  */
31 
32 import jdk.incubator.foreign.MemoryAccess;
33 import jdk.incubator.foreign.MemoryAddress;
34 import jdk.incubator.foreign.MemoryLayout;
35 import jdk.incubator.foreign.MemorySegment;
36 import jdk.incubator.foreign.ResourceScope;
37 
38 import static jdk.incubator.foreign.CLinker.*;
39 import static org.testng.Assert.assertEquals;
40 
41 public class TestFree {
42     private static MemorySegment asArray(MemoryAddress addr, MemoryLayout layout, int numElements) {
43         return addr.asSegment(numElements * layout.byteSize(), ResourceScope.globalScope());
44     }
45 
46     public void test() throws Throwable {
47         String str = "hello world";
48         MemoryAddress addr = allocateMemory(str.length() + 1);
49         MemorySegment seg = asArray(addr, C_CHAR, str.length() + 1);
50         seg.copyFrom(MemorySegment.ofArray(str.getBytes()));
51         MemoryAccess.setByteAtOffset(seg, str.length(), (byte)0);
52         assertEquals(str, toJavaString(seg));
53         freeMemory(addr);
54     }
55 }