/*
* Copyright ( c ) 2019 , 2022 , 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 .
*
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*/
import java.lang.foreign.Arena;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.VarHandle;
import org.testng.annotations.*;
import static org.testng.Assert .*;
/*
* @ test
* @ enablePreview
* @ run testng / othervm - Xverify : all TestSlices
*/
public class TestSlices {
static MemoryLayout LAYOUT = MemoryLayout.sequenceLayout(2 ,
MemoryLayout.sequenceLayout(5 , ValueLayout.JAVA_INT));
static VarHandle VH_ALL = LAYOUT.varHandle(
MemoryLayout.PathElement.sequenceElement(), MemoryLayout.PathElement.sequenceElement());
@Test(dataProvider = "slices" )
public void testSlices(VarHandle handle, int lo, int hi, int [] values) {
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(LAYOUT, arena.scope());;
//init
for (long i = 0 ; i < 2 ; i++) {
for (long j = 0 ; j < 5 ; j++) {
VH_ALL.set(segment, i, j, (int )j + 1 + ((int )i * 5 ));
}
}
checkSlice(segment, handle, lo, hi, values);
}
}
@Test(dataProvider = "slices" )
public void testSliceBadIndex(VarHandle handle, int lo, int hi, int [] values) {
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(LAYOUT, arena.scope());;
assertThrows(() -> handle.get(segment, lo, 0 ));
assertThrows(() -> handle.get(segment, 0 , hi));
}
}
static void checkSlice(MemorySegment segment, VarHandle handle, long i_max, long j_max, int ... values) {
int index = 0 ;
for (long i = 0 ; i < i_max ; i++) {
for (long j = 0 ; j < j_max ; j++) {
int x = (int ) handle.get(segment, i, j);
assertEquals(x, values[index++]);
}
}
assertEquals(index, values.length);
}
@DataProvider(name = "slices" )
static Object[][] slices() {
return new Object[][] {
// x
{ VH_ALL, 2 , 5 , new int [] { 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 } },
// x[0::2]
{ LAYOUT.varHandle(MemoryLayout.PathElement.sequenceElement(),
MemoryLayout.PathElement.sequenceElement(0 , 2 )), 2 , 3 , new int [] { 1 , 3 , 5 , 6 , 8 , 10 } },
// x[1::2]
{ LAYOUT.varHandle(MemoryLayout.PathElement.sequenceElement(),
MemoryLayout.PathElement.sequenceElement(1 , 2 )), 2 , 2 , new int [] { 2 , 4 , 7 , 9 } },
// x[4::-2]
{ LAYOUT.varHandle(MemoryLayout.PathElement.sequenceElement(),
MemoryLayout.PathElement.sequenceElement(4 , -2 )), 2 , 3 , new int [] { 5 , 3 , 1 , 10 , 8 , 6 } },
// x[3::-2]
{ LAYOUT.varHandle(MemoryLayout.PathElement.sequenceElement(),
MemoryLayout.PathElement.sequenceElement(3 , -2 )), 2 , 2 , new int [] { 4 , 2 , 9 , 7 } },
};
}
}
Messung V0.5 in Prozent C=94 H=95 G=94
¤ Dauer der Verarbeitung: 0.1 Sekunden
(vorverarbeitet am 2026-10-11)
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