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/*
* Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @enablePreview
* @run testng TestSegmentOffset
*/
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.ArrayList;
import java.util.List;
import java.util.function.IntFunction;
import static java.lang.System.out;
import static java.lang.foreign.ValueLayout.JAVA_BYTE;
import static org.testng.Assert.*;
public class TestSegmentOffset {
@Test(dataProvider = "slices")
public void testOffset(SegmentSlice s1, SegmentSlice s2) {
if (s1.contains(s2)) {
// check that a segment and its overlapping segment point to same elements
long offset = s1.segment.segmentOffset(s2.segment);
for (int i = 0; i < s2.size(); i++) {
out.format("testOffset s1:%s, s2:%s, offset:%d, i:%s\n", s1, s2, offset, i);
byte expected = s2.segment.get(JAVA_BYTE, i);
byte found = s1.segment.get(JAVA_BYTE, i + offset);
assertEquals(found, expected);
}
} else if (s1.kind != s2.kind) {
// check that offset from s1 to s2 fails
try {
long offset = s1.segment.segmentOffset(s2.segment);
out.format("testOffset s1:%s, s2:%s, offset:%d\n", s1, s2, offset);
fail("offset unexpectedly passed!");
} catch (UnsupportedOperationException ex) {
assertTrue(ex.getMessage().contains("Cannot compute offset from native to heap (or vice versa)."));
}
} else if (!s2.contains(s1)) {
// disjoint segments - check that offset is out of bounds
long offset = s1.segment.segmentOffset(s2.segment);
for (int i = 0; i < s2.size(); i++) {
out.format("testOffset s1:%s, s2:%s, offset:%d, i:%s\n", s1, s2, offset, i);
s2.segment.get(JAVA_BYTE, i);
try {
s1.segment.get(JAVA_BYTE, i + offset);
fail("Offset on a disjoint segment is not out of bounds!");
} catch (IndexOutOfBoundsException ex) {
assertTrue(true);
}
}
}
}
static class SegmentSlice {
enum Kind {
NATIVE(i -> Arena.ofAuto().allocate(i, 1)),
ARRAY(i -> MemorySegment.ofArray(new byte[i]));
final IntFunction<MemorySegment> segmentFactory;
Kind(IntFunction<MemorySegment> segmentFactory) {
this.segmentFactory = segmentFactory;
}
MemorySegment makeSegment(int elems) {
return segmentFactory.apply(elems);
}
}
final Kind kind;
final int first;
final int last;
final MemorySegment segment;
public SegmentSlice(Kind kind, int first, int last, MemorySegment segment) {
this.kind = kind;
this.first = first;
this.last = last;
this.segment = segment;
}
boolean contains(SegmentSlice other) {
return kind == other.kind &&
first <= other.first &&
last >= other.last;
}
int size() {
return last - first + 1;
}
}
@DataProvider(name = "slices")
static Object[][] slices() {
int[] sizes = { 16, 8, 4, 2, 1 };
List<SegmentSlice> slices = new ArrayList<>();
for (SegmentSlice.Kind kind : SegmentSlice.Kind.values()) {
// init root segment
MemorySegment segment = kind.makeSegment(16);
for (int i = 0 ; i < 16 ; i++) {
segment.set(JAVA_BYTE, i, (byte)i);
}
// compute all slices
for (int size : sizes) {
for (int index = 0 ; index < 16 ; index += size) {
MemorySegment slice = segment.asSlice(index, size);
slices.add(new SegmentSlice(kind, index, index + size - 1, slice));
}
}
}
Object[][] sliceArray = new Object[slices.size() * slices.size()][];
for (int i = 0 ; i < slices.size() ; i++) {
for (int j = 0 ; j < slices.size() ; j++) {
sliceArray[i * slices.size() + j] = new Object[] { slices.get(i), slices.get(j) };
}
}
return sliceArray;
}
}
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