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/*
* @ test
* @ enablePreview
* @ run testng TestSegmentCopy
*/
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SegmentScope;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;
import java.util.function .IntFunction;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static java.lang.foreign.ValueLayout.JAVA_BYTE;
import static org.testng.Assert .*;
public class TestSegmentCopy {
@Test(dataProvider = "slices" )
public void testByteCopy(SegmentSlice s1, SegmentSlice s2) {
int size = Math.min(s1.byteSize(), s2.byteSize());
//prepare source and target segments
for (int i = 0 ; i < size ; i++) {
Type.BYTE .set(s2, i, 0 );
}
for (int i = 0 ; i < size ; i++) {
Type.BYTE .set(s1, i, i);
}
//perform copy
MemorySegment.copy(s1.segment, 0 , s2.segment, 0 , size);
//check that copy actually worked
for (int i = 0 ; i < size ; i++) {
Type.BYTE .check(s2, i, i);
}
}
@Test(dataProvider = "slices" )
public void testElementCopy(SegmentSlice s1, SegmentSlice s2) {
if (s1.type.carrier != s2.type.carrier) return ;
int size = Math.min(s1.elementSize(), s2.elementSize());
//prepare source and target segments
for (int i = 0 ; i < size ; i++) {
s2.set(i, 0 );
}
for (int i = 0 ; i < size ; i++) {
s1.set(i, i);
}
//perform copy
MemorySegment.copy(s1.segment, s1.type.layout, 0 , s2.segment, s2.type.layout, 0 , size);
//check that copy actually worked
for (int i = 0 ; i < size; i++) {
s2.check(i, i);
}
}
@Test(expectedExceptions = IllegalArgumentException.class )
public void testHyperAlignedSrc() {
MemorySegment segment = MemorySegment.ofArray(new byte [] {1 , 2 , 3 , 4 });
MemorySegment.copy(segment, 0 , segment, JAVA_BYTE.withBitAlignment(16 ), 0 , 4 );
}
@Test(expectedExceptions = IllegalArgumentException.class )
public void testHyperAlignedDst() {
MemorySegment segment = MemorySegment.ofArray(new byte [] {1 , 2 , 3 , 4 });
MemorySegment.copy(segment, JAVA_BYTE.withBitAlignment(16 ), 0 , segment, 0 , 4 );
}
enum Type {
// Byte
BYTE (byte .class , JAVA_BYTE, i -> (byte )i),
//LE
SHORT_LE(short .class , ValueLayout.JAVA_SHORT.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> (short )i),
CHAR_LE(char .class , ValueLayout.JAVA_CHAR.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> (char )i),
INT_LE(int .class , ValueLayout.JAVA_INT.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> i),
FLOAT_LE(float .class , ValueLayout.JAVA_FLOAT.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> (float )i),
LONG_LE(long .class , ValueLayout.JAVA_LONG.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> (long )i),
DOUBLE_LE(double .class , ValueLayout.JAVA_DOUBLE.withBitAlignment(8 ).withOrder(ByteOrder.LITTLE_ENDIAN), i -> (double )i),
//BE
SHORT_BE(short .class , ValueLayout.JAVA_SHORT.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> (short )i),
CHAR_BE(char .class , ValueLayout.JAVA_CHAR.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> (char )i),
INT_BE(int .class , ValueLayout.JAVA_INT.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> i),
FLOAT_BE(float .class , ValueLayout.JAVA_FLOAT.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> (float )i),
LONG_BE(long .class , ValueLayout.JAVA_LONG.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> (long )i),
DOUBLE_BE(double .class , ValueLayout.JAVA_DOUBLE.withBitAlignment(8 ).withOrder(ByteOrder.BIG_ENDIAN), i -> (double )i);
final ValueLayout layout;
final IntFunction<Object> valueConverter;
final Class <?> carrier;
@SuppressWarnings("unchecked" )
<Z> Type(Class <Z> carrier, ValueLayout layout, IntFunction<Z> valueConverter) {
this .carrier = carrier;
this .layout = layout;
this .valueConverter = (IntFunction<Object>)valueConverter;
}
int size() {
return (int )layout.byteSize();
}
VarHandle handle() {
return MethodHandles.memorySegmentViewVarHandle(layout);
}
void set(SegmentSlice slice, int index, int val) {
handle().set(slice.segment, index * size(), valueConverter.apply(val));
}
void check(SegmentSlice slice, int index, int val) {
assertEquals(handle().get(slice.segment, index * size()), valueConverter.apply(val));
}
}
static class SegmentSlice {
enum Kind {
NATIVE (i -> MemorySegment.allocateNative(i, SegmentScope.auto())),
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 Type type;
final int first;
final int last;
final MemorySegment segment;
public SegmentSlice(Kind kind, Type type, int first, int last, MemorySegment segment) {
this .kind = kind;
this .type = type;
this .first = first;
this .last = last;
this .segment = segment;
}
void set(int index, int val) {
type.set(this , index, val);
}
void check(int index, int val) {
type.check(this , index, val);
}
int byteSize() {
return last - first + 1 ;
}
int elementSize() {
return byteSize() / type.size();
}
@Override
public String toString() {
return String.format("SegmentSlice{%s, %d, %d}" , type, first, last);
}
}
@DataProvider(name = "slices" )
static Object[][] elementSlices() {
List<SegmentSlice> slices = new ArrayList<>();
for (SegmentSlice.Kind kind : SegmentSlice.Kind.values()) {
MemorySegment segment = kind.makeSegment(16 );
//compute all slices
for (Type type : Type.values()) {
for (int index = 0 ; index < 16 ; index += type.size()) {
MemorySegment first = segment.asSlice(0 , index);
slices.add(new SegmentSlice(kind, type, 0 , index - 1 , first));
MemorySegment second = segment.asSlice(index);
slices.add(new SegmentSlice(kind, type, index, 15 , second));
}
}
}
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;
}
}
Messung V0.5 in Prozent C=93 H=92 G=92
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-06-10)
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