1 /*
  2  * Copyright (c) 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 /*
 26  * @test
 27  * @run testng TestMemoryCopy
 28  */
 29 
 30 import jdk.incubator.foreign.MemoryLayouts;
 31 import jdk.incubator.foreign.MemorySegment;
 32 import jdk.incubator.foreign.ResourceScope;
 33 import org.testng.annotations.DataProvider;
 34 import org.testng.annotations.Test;
 35 
 36 import java.lang.invoke.VarHandle;
 37 import java.util.ArrayList;
 38 import java.util.List;
 39 import java.util.function.IntFunction;
 40 
 41 import static org.testng.Assert.*;
 42 
 43 public class TestMemoryCopy {
 44 
 45     final static VarHandle BYTE_HANDLE = MemoryLayouts.JAVA_BYTE.varHandle(byte.class);
 46 
 47     @Test(dataProvider = "slices")
 48     public void testCopy(SegmentSlice s1, SegmentSlice s2) {
 49         int size = Math.min(s1.size(), s2.size());
 50         //prepare source and target segments
 51         for (int i = 0 ; i < size ; i++) {
 52             BYTE_HANDLE.set(s2.segment.asSlice(i), (byte)0);
 53         }
 54         for (int i = 0 ; i < size ; i++) {
 55             BYTE_HANDLE.set(s1.segment.asSlice(i), (byte) i);
 56         }
 57         //perform copy
 58         s2.segment.copyFrom(s1.segment.asSlice(0, size));
 59         //check that copy actually worked
 60         for (int i = 0 ; i < size ; i++) {
 61             assertEquals((byte)i, BYTE_HANDLE.get(s2.segment.asSlice(i)));
 62         }
 63     }
 64 
 65     static class SegmentSlice {
 66 
 67         enum Kind {
 68             NATIVE(i -> MemorySegment.allocateNative(i, ResourceScope.newImplicitScope())),
 69             ARRAY(i -> MemorySegment.ofArray(new byte[i]));
 70 
 71             final IntFunction<MemorySegment> segmentFactory;
 72 
 73             Kind(IntFunction<MemorySegment> segmentFactory) {
 74                 this.segmentFactory = segmentFactory;
 75             }
 76 
 77             MemorySegment makeSegment(int elems) {
 78                 return segmentFactory.apply(elems);
 79             }
 80         }
 81 
 82         final Kind kind;
 83         final int first;
 84         final int last;
 85         final MemorySegment segment;
 86 
 87         public SegmentSlice(Kind kind, int first, int last, MemorySegment segment) {
 88             this.kind = kind;
 89             this.first = first;
 90             this.last = last;
 91             this.segment = segment;
 92         }
 93 
 94         int size() {
 95             return last - first + 1;
 96         }
 97     }
 98 
 99     @DataProvider(name = "slices")
100     static Object[][] slices() {
101         int[] sizes = { 16, 8, 4, 2, 1 };
102         List<SegmentSlice> slices = new ArrayList<>();
103         for (SegmentSlice.Kind kind : SegmentSlice.Kind.values()) {
104             MemorySegment segment = kind.makeSegment(16);
105             //compute all slices
106             for (int size : sizes) {
107                 for (int index = 0 ; index < 16 ; index += size) {
108                     MemorySegment slice = segment.asSlice(index, size);
109                     slices.add(new SegmentSlice(kind, index, index + size - 1, slice));
110                 }
111             }
112         }
113         Object[][] sliceArray = new Object[slices.size() * slices.size()][];
114         for (int i = 0 ; i < slices.size() ; i++) {
115             for (int j = 0 ; j < slices.size() ; j++) {
116                 sliceArray[i * slices.size() + j] = new Object[] { slices.get(i), slices.get(j) };
117             }
118         }
119         return sliceArray;
120     }
121 }