/*
* Copyright ( c ) 2019 , 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 ) .
*
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* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
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/*
* @ test
* @ enablePreview
* @ requires ( ( os . arch = = " amd64 " | os . arch = = " x86_64 " ) & sun . arch . data . model = = " 64 " ) | os . arch = = " aarch64 "
* @ run testng / othervm - Xmx4G - XX : MaxDirectMemorySize = 1 M - - enable - native - access = ALL - UNNAMED TestSegments
*/
import java.lang.foreign.Arena;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SegmentScope;
import java.lang.foreign.ValueLayout;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.lang.invoke.VarHandle;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function .IntFunction;
import java.util.function .Supplier;
import static java.lang.foreign.ValueLayout.JAVA_INT;
import static org.testng.Assert .*;
public class TestSegments {
@Test(dataProvider = "badSizeAndAlignments" , expectedExceptions = IllegalArgumentException.class )
public void testBadAllocateAlign(long size, long align) {
MemorySegment.allocateNative(size, align, SegmentScope.auto());
}
@Test
public void testZeroLengthNativeSegment() {
try (Arena arena = Arena.openConfined()) {
SegmentScope session = arena.scope();
var segment = MemorySegment.allocateNative(0 , session);
assertEquals(segment.byteSize(), 0 );
MemoryLayout seq = MemoryLayout.sequenceLayout(0 , JAVA_INT);
segment = MemorySegment.allocateNative(seq, session);
assertEquals(segment.byteSize(), 0 );
assertEquals(segment.address() % seq.byteAlignment(), 0 );
segment = MemorySegment.allocateNative(0 , 4 , session);
assertEquals(segment.byteSize(), 0 );
assertEquals(segment.address() % 4 , 0 );
MemorySegment rawAddress = MemorySegment.ofAddress(segment.address(), 0 , session);
assertEquals(rawAddress.byteSize(), 0 );
assertEquals(rawAddress.address() % 4 , 0 );
}
}
@Test(expectedExceptions = { OutOfMemoryError.class ,
IllegalArgumentException.class })
public void testAllocateTooBig() {
MemorySegment.allocateNative(Long .MAX_VALUE, SegmentScope.auto());
}
@Test(expectedExceptions = OutOfMemoryError.class )
public void testNativeAllocationTooBig() {
MemorySegment segment = MemorySegment.allocateNative(1024 L * 1024 * 8 * 2 , SegmentScope.auto()); // 2M
}
@Test
public void testNativeSegmentIsZeroed() {
VarHandle byteHandle = ValueLayout.JAVA_BYTE.arrayElementVarHandle();
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(1000 , 1 , arena.scope());
for (long i = 0 ; i < segment.byteSize() ; i++) {
assertEquals(0 , (byte )byteHandle.get(segment, i));
}
}
}
@Test
public void testSlices() {
VarHandle byteHandle = ValueLayout.JAVA_BYTE.arrayElementVarHandle();
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(10 , 1 , arena.scope());
//init
for (byte i = 0 ; i < segment.byteSize() ; i++) {
byteHandle.set(segment, (long )i, i);
}
for (int offset = 0 ; offset < 10 ; offset++) {
MemorySegment slice = segment.asSlice(offset);
for (long i = offset ; i < 10 ; i++) {
assertEquals(
byteHandle.get(segment, i),
byteHandle.get(slice, i - offset)
);
}
}
}
}
@Test
public void testEqualsOffHeap() {
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(100 , arena.scope());
assertEquals(segment, segment.asReadOnly());
assertEquals(segment, segment.asSlice(0 , 100 ));
assertNotEquals(segment, segment.asSlice(10 , 90 ));
assertEquals(segment, segment.asSlice(0 , 90 ));
assertEquals(segment, MemorySegment.ofAddress(segment.address(), 100 , SegmentScope.global()));
MemorySegment segment2 = MemorySegment.allocateNative(100 , arena.scope());
assertNotEquals(segment, segment2);
}
}
@Test
public void testEqualsOnHeap() {
MemorySegment segment = MemorySegment.ofArray(new byte [100 ]);
assertEquals(segment, segment.asReadOnly());
assertEquals(segment, segment.asSlice(0 , 100 ));
assertNotEquals(segment, segment.asSlice(10 , 90 ));
assertEquals(segment, segment.asSlice(0 , 90 ));
MemorySegment segment2 = MemorySegment.ofArray(new byte [100 ]);
assertNotEquals(segment, segment2);
}
@Test
public void testHashCodeOffHeap() {
try (Arena arena = Arena.openConfined()) {
MemorySegment segment = MemorySegment.allocateNative(100 , arena.scope());
assertEquals(segment.hashCode(), segment.asReadOnly().hashCode());
assertEquals(segment.hashCode(), segment.asSlice(0 , 100 ).hashCode());
assertEquals(segment.hashCode(), segment.asSlice(0 , 90 ).hashCode());
assertEquals(segment.hashCode(), MemorySegment.ofAddress(segment.address(), 100 , SegmentScope.global()).hashCode());
}
}
@Test
public void testHashCodeOnHeap() {
MemorySegment segment = MemorySegment.ofArray(new byte [100 ]);
assertEquals(segment.hashCode(), segment.asReadOnly().hashCode());
assertEquals(segment.hashCode(), segment.asSlice(0 , 100 ).hashCode());
assertEquals(segment.hashCode(), segment.asSlice(0 , 90 ).hashCode());
}
@Test(expectedExceptions = IndexOutOfBoundsException.class )
public void testSmallSegmentMax() {
long offset = (long )Integer.MAX_VALUE + (long )Integer.MAX_VALUE + 2 L + 6 L; // overflows to 6 when cast to int
MemorySegment memorySegment = MemorySegment.allocateNative(10 , SegmentScope.auto());
memorySegment.get(JAVA_INT, offset);
}
@Test(expectedExceptions = IndexOutOfBoundsException.class )
public void testSmallSegmentMin() {
long offset = ((long )Integer.MIN_VALUE * 2 L) + 6 L; // underflows to 6 when cast to int
MemorySegment memorySegment = MemorySegment.allocateNative(10 L, SegmentScope.auto());
memorySegment.get(JAVA_INT, offset);
}
@Test
public void testSegmentOOBMessage() {
try {
var segment = MemorySegment.allocateNative(10 , SegmentScope.global());
segment.getAtIndex(ValueLayout.JAVA_INT, 2 );
} catch (IndexOutOfBoundsException ex) {
assertTrue(ex.getMessage().contains("Out of bound access" ));
assertTrue(ex.getMessage().contains("offset = 8" ));
assertTrue(ex.getMessage().contains("length = 4" ));
}
}
@Test(dataProvider = "segmentFactories" )
public void testAccessModesOfFactories(Supplier<MemorySegment> segmentSupplier) {
MemorySegment segment = segmentSupplier.get();
assertFalse(segment.isReadOnly());
}
@DataProvider(name = "scopes" )
public Object[][] scopes() {
return new Object[][] {
{ SegmentScope.auto(), false },
{ SegmentScope.global(), false },
{ Arena.openConfined().scope(), true },
{ Arena.openShared().scope(), false }
};
}
@Test(dataProvider = "scopes" )
public void testIsAccessibleBy(SegmentScope scope, boolean isConfined) {
assertTrue(scope.isAccessibleBy(Thread .currentThread()));
assertTrue(scope.isAccessibleBy(new Thread ()) != isConfined);
MemorySegment segment = MemorySegment.ofAddress(0 , 0 , scope);
assertTrue(segment.scope().isAccessibleBy(Thread .currentThread()));
assertTrue(segment.scope().isAccessibleBy(new Thread ()) != isConfined);
}
@DataProvider(name = "segmentFactories" )
public Object[][] segmentFactories() {
List<Supplier<MemorySegment>> l = List.of(
() -> MemorySegment.ofArray(new byte [] { 0 x00, 0 x01, 0 x02, 0 x03 }),
() -> MemorySegment.ofArray(new char [] {'a' , 'b' , 'c' , 'd' }),
() -> MemorySegment.ofArray(new double [] { 1 d, 2 d, 3 d, 4 d} ),
() -> MemorySegment.ofArray(new float [] { 1 .0 f, 2 .0 f, 3 .0 f, 4 .0 f }),
() -> MemorySegment.ofArray(new int [] { 1 , 2 , 3 , 4 }),
() -> MemorySegment.ofArray(new long [] { 1 l, 2 l, 3 l, 4 l } ),
() -> MemorySegment.ofArray(new short [] { 1 , 2 , 3 , 4 } ),
() -> MemorySegment.allocateNative(4 L, SegmentScope.auto()),
() -> MemorySegment.allocateNative(4 L, 8 , SegmentScope.auto()),
() -> MemorySegment.allocateNative(JAVA_INT, SegmentScope.auto()),
() -> MemorySegment.allocateNative(4 L, SegmentScope.auto()),
() -> MemorySegment.allocateNative(4 L, 8 , SegmentScope.auto()),
() -> MemorySegment.allocateNative(JAVA_INT, SegmentScope.auto())
);
return l.stream().map(s -> new Object[] { s }).toArray(Object[][]::new );
}
@Test(dataProvider = "segmentFactories" )
public void testFill(Supplier<MemorySegment> segmentSupplier) {
VarHandle byteHandle = ValueLayout.JAVA_BYTE.arrayElementVarHandle();
for (byte value : new byte [] {(byte ) 0 xFF, (byte ) 0 x00, (byte ) 0 x45}) {
MemorySegment segment = segmentSupplier.get();
segment.fill(value);
for (long l = 0 ; l < segment.byteSize(); l++) {
assertEquals((byte ) byteHandle.get(segment, l), value);
}
// fill a slice
var sliceSegment = segment.asSlice(1 , segment.byteSize() - 2 ).fill((byte ) ~value);
for (long l = 0 ; l < sliceSegment.byteSize(); l++) {
assertEquals((byte ) byteHandle.get(sliceSegment, l), ~value);
}
// assert enclosing slice
assertEquals((byte ) byteHandle.get(segment, 0 L), value);
for (long l = 1 ; l < segment.byteSize() - 2 ; l++) {
assertEquals((byte ) byteHandle.get(segment, l), (byte ) ~value);
}
assertEquals((byte ) byteHandle.get(segment, segment.byteSize() - 1 L), value);
}
}
@Test(dataProvider = "segmentFactories" )
public void testNativeSegments(Supplier<MemorySegment> segmentSupplier) {
MemorySegment segment = segmentSupplier.get();
assertEquals(segment.isNative(), !segment.array().isPresent());
}
@Test(dataProvider = "segmentFactories" , expectedExceptions = UnsupportedOperationException.class )
public void testFillIllegalAccessMode(Supplier<MemorySegment> segmentSupplier) {
MemorySegment segment = segmentSupplier.get();
segment.asReadOnly().fill((byte ) 0 xFF);
}
@Test(dataProvider = "segmentFactories" )
public void testFillThread(Supplier<MemorySegment> segmentSupplier) throws Exception {
MemorySegment segment = segmentSupplier.get();
AtomicReference<RuntimeException> exception = new AtomicReference<>();
Runnable action = () -> {
try {
segment.fill((byte ) 0 xBA);
} catch (RuntimeException e) {
exception.set(e);
}
};
Thread thread = new Thread (action);
thread .start();
thread .join();
if (!segment.scope().isAccessibleBy(Thread .currentThread())) {
RuntimeException e = exception.get();
throw e;
} else {
assertNull(exception.get());
}
}
@Test
public void testFillEmpty() {
MemorySegment.ofArray(new byte [] { }).fill((byte ) 0 xFF);
MemorySegment.ofArray(new byte [2 ]).asSlice(0 , 0 ).fill((byte ) 0 xFF);
MemorySegment.ofBuffer(ByteBuffer.allocateDirect(0 )).fill((byte ) 0 xFF);
}
@Test(dataProvider = "heapFactories" )
public void testVirtualizedBaseAddress(IntFunction<MemorySegment> heapSegmentFactory, int factor) {
MemorySegment segment = heapSegmentFactory.apply(10 );
assertEquals(segment.address(), 0 ); // base address should be zero (no leaking of impl details)
MemorySegment end = segment.asSlice(segment.byteSize(), 0 );
assertEquals(end.address(), segment.byteSize()); // end address should be equal to segment byte size
}
@DataProvider(name = "badSizeAndAlignments" )
public Object[][] sizesAndAlignments() {
return new Object[][] {
{ -1 , 8 },
{ 1 , 15 },
{ 1 , -15 }
};
}
@DataProvider(name = "heapFactories" )
public Object[][] heapFactories() {
return new Object[][] {
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new byte [size]), 1 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new char [size]), 2 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new short [size]), 2 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new int [size]), 4 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new float [size]), 4 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new long [size]), 8 },
{ (IntFunction<MemorySegment>) size -> MemorySegment.ofArray(new double [size]), 8 }
};
}
}
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