1 /*
2 * Copyright (c) 2020, 2023, 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 *
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23 */
24
25 /*
26 * @test
27 * @enablePreview
28 * @modules java.base/jdk.internal.foreign
29 * @run testng/othervm TestSegmentAllocators
30 */
31
32 import java.lang.foreign.*;
33
34 import jdk.internal.foreign.MappedMemorySegmentImpl;
35 import jdk.internal.foreign.NativeMemorySegmentImpl;
36 import org.testng.annotations.*;
37
38 import java.lang.foreign.Arena;
39 import java.lang.invoke.VarHandle;
40 import java.nio.ByteBuffer;
41 import java.nio.ByteOrder;
42 import java.nio.CharBuffer;
43 import java.nio.DoubleBuffer;
44 import java.nio.FloatBuffer;
45 import java.nio.IntBuffer;
46 import java.nio.LongBuffer;
47 import java.nio.ShortBuffer;
48 import java.util.ArrayList;
49 import java.util.List;
50 import java.util.concurrent.atomic.AtomicInteger;
51 import java.util.function.BiFunction;
52 import java.util.function.Function;
53
54 import static org.testng.Assert.*;
55
56 public class TestSegmentAllocators {
57
58 final static int ELEMS = 128;
59
60 @Test(dataProvider = "scalarAllocations")
61 @SuppressWarnings("unchecked")
62 public <Z, L extends ValueLayout> void testAllocation(Z value, AllocationFactory allocationFactory, L layout, AllocationFunction<Z, L> allocationFunction, Function<MemoryLayout, VarHandle> handleFactory) {
63 layout = (L)layout.withByteAlignment(layout.byteSize());
64 L[] layouts = (L[])new ValueLayout[] {
65 layout,
66 layout.withByteAlignment(layout.byteAlignment() * 2),
67 layout.withByteAlignment(layout.byteAlignment() * 4),
68 layout.withByteAlignment(layout.byteAlignment() * 8)
69 };
70 for (L alignedLayout : layouts) {
71 List<MemorySegment> addressList = new ArrayList<>();
72 int elems = ELEMS / ((int)alignedLayout.byteAlignment() / (int)layout.byteAlignment());
73 Arena[] arenas = {
74 Arena.ofConfined(),
75 Arena.ofShared()
76 };
77 for (Arena arena : arenas) {
78 try (arena) {
79 SegmentAllocator allocator = allocationFactory.allocator(alignedLayout.byteSize() * ELEMS, arena);
80 for (int i = 0; i < elems; i++) {
81 MemorySegment address = allocationFunction.allocate(allocator, alignedLayout, value);
82 assertEquals(address.byteSize(), alignedLayout.byteSize());
83 addressList.add(address);
84 VarHandle handle = handleFactory.apply(alignedLayout);
85 assertEquals(value, handle.get(address));
86 }
87 boolean isBound = allocationFactory.isBound();
88 try {
89 allocationFunction.allocate(allocator, alignedLayout, value);
90 assertFalse(isBound);
91 } catch (IndexOutOfBoundsException ex) {
92 //failure is expected if bound
93 assertTrue(isBound);
94 }
95 }
96 // addresses should be invalid now
97 for (MemorySegment address : addressList) {
98 assertFalse(address.scope().isAlive());
99 }
100 }
101 }
102 }
103
104 static final int SIZE_256M = 1024 * 1024 * 256;
105
106 @Test
107 public void testBigAllocationInUnboundedSession() {
108 try (Arena arena = Arena.ofConfined()) {
109 for (int i = 8 ; i < SIZE_256M ; i *= 8) {
110 SegmentAllocator allocator = SegmentAllocator.slicingAllocator(arena.allocate(i * 2 + 1));
111 MemorySegment address = allocator.allocate(i, i);
112 //check size
113 assertEquals(address.byteSize(), i);
114 //check alignment
115 assertEquals(address.address() % i, 0);
116 }
117 }
118 }
119
120 @Test
121 public void testTooBigForBoundedArena() {
122 try (Arena arena = Arena.ofConfined()) {
123 SegmentAllocator allocator = SegmentAllocator.slicingAllocator(arena.allocate(10));
124 assertThrows(IndexOutOfBoundsException.class, () -> allocator.allocate(12));
125 allocator.allocate(5);
126 }
127 }
128
129 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
130 public void testBadAllocationSize(SegmentAllocator allocator) {
131 allocator.allocate(-1);
132 }
133
134 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
135 public void testBadAllocationAlignZero(SegmentAllocator allocator) {
136 allocator.allocate(1, 0);
137 }
138
139 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
140 public void testBadAllocationAlignNeg(SegmentAllocator allocator) {
141 allocator.allocate(1, -1);
142 }
143
144 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
145 public void testBadAllocationAlignNotPowerTwo(SegmentAllocator allocator) {
146 allocator.allocate(1, 3);
147 }
148
149 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
150 public void testBadAllocationArrayNegSize(SegmentAllocator allocator) {
151 allocator.allocateArray(ValueLayout.JAVA_BYTE, -1);
152 }
153
154 @Test(dataProvider = "allocators", expectedExceptions = IllegalArgumentException.class)
155 public void testBadAllocationArrayOverflow(SegmentAllocator allocator) {
156 allocator.allocateArray(ValueLayout.JAVA_LONG, Long.MAX_VALUE);
157 }
158
159 @Test(expectedExceptions = OutOfMemoryError.class)
160 public void testBadArenaNullReturn() {
161 try (Arena arena = Arena.ofConfined()) {
162 arena.allocate(Long.MAX_VALUE, 2);
163 }
164 }
165
166 @Test
167 public void testArrayAllocateDelegation() {
168 AtomicInteger calls = new AtomicInteger();
169 SegmentAllocator allocator = new SegmentAllocator() {
170 @Override
171 public MemorySegment allocate(long bytesSize, long byteAlignment) {
172 return null;
173 }
174
175 @Override
176 public MemorySegment allocateArray(MemoryLayout elementLayout, long count) {
177 calls.incrementAndGet();
178 return null;
179 };
180 };
181 allocator.allocateArray(ValueLayout.JAVA_BYTE);
182 allocator.allocateArray(ValueLayout.JAVA_SHORT);
183 allocator.allocateArray(ValueLayout.JAVA_CHAR);
184 allocator.allocateArray(ValueLayout.JAVA_INT);
185 allocator.allocateArray(ValueLayout.JAVA_FLOAT);
186 allocator.allocateArray(ValueLayout.JAVA_LONG);
187 allocator.allocateArray(ValueLayout.JAVA_DOUBLE);
188 assertEquals(calls.get(), 7);
189 }
190
191 @Test
192 public void testStringAllocateDelegation() {
193 AtomicInteger calls = new AtomicInteger();
194 SegmentAllocator allocator = new SegmentAllocator() {
195 @Override
196
197 public MemorySegment allocate(long byteSize, long byteAlignment) {
198 return Arena.ofAuto().allocate(byteSize, byteAlignment);
199 }
200
201 @Override
202 public MemorySegment allocate(long size) {
203 calls.incrementAndGet();
204 return allocate(size, 1);
205 };
206 };
207 allocator.allocateUtf8String("Hello");
208 assertEquals(calls.get(), 1);
209 }
210
211
212 @Test(dataProvider = "arrayAllocations")
213 public <Z> void testArray(AllocationFactory allocationFactory, ValueLayout layout, AllocationFunction<Object, ValueLayout> allocationFunction, ToArrayHelper<Z> arrayHelper) {
214 Z arr = arrayHelper.array();
215 Arena[] arenas = {
216 Arena.ofConfined(),
217 Arena.ofShared()
218 };
219 for (Arena arena : arenas) {
220 try (arena) {
221 SegmentAllocator allocator = allocationFactory.allocator(100, arena);
222 MemorySegment address = allocationFunction.allocate(allocator, layout, arr);
223 Z found = arrayHelper.toArray(address, layout);
224 assertEquals(found, arr);
225 }
226 }
227 }
228
229 @Test(dataProvider = "arrayAllocations")
230 public <Z> void testPredicatesAndCommands(AllocationFactory allocationFactory, ValueLayout layout, AllocationFunction<Object, ValueLayout> allocationFunction, ToArrayHelper<Z> arrayHelper) {
231 Z arr = arrayHelper.array();
232 Arena[] arenas = {
233 Arena.ofConfined(),
234 Arena.ofShared()
235 };
236 for (Arena arena : arenas) {
237 try (arena) {
238 SegmentAllocator allocator = allocationFactory.allocator(100, arena);
239 MemorySegment segment = allocationFunction.allocate(allocator, layout, arr);
240 assertThrows(UnsupportedOperationException.class, segment::load);
241 assertThrows(UnsupportedOperationException.class, segment::unload);
242 assertThrows(UnsupportedOperationException.class, segment::isLoaded);
243 assertThrows(UnsupportedOperationException.class, segment::force);
244 assertFalse(segment.isMapped());
245 assertEquals(segment.isNative(), segment instanceof NativeMemorySegmentImpl);
246 }
247 }
248 }
249
250 @DataProvider(name = "scalarAllocations")
251 static Object[][] scalarAllocations() {
252 List<Object[]> scalarAllocations = new ArrayList<>();
253 for (AllocationFactory factory : AllocationFactory.values()) {
254 scalarAllocations.add(new Object[] { (byte)42, factory, ValueLayout.JAVA_BYTE,
255 (AllocationFunction.OfByte) SegmentAllocator::allocate,
256 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
257 scalarAllocations.add(new Object[] { (short)42, factory, ValueLayout.JAVA_SHORT.withOrder(ByteOrder.BIG_ENDIAN),
258 (AllocationFunction.OfShort) SegmentAllocator::allocate,
259 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
260 scalarAllocations.add(new Object[] { (char)42, factory, ValueLayout.JAVA_CHAR.withOrder(ByteOrder.BIG_ENDIAN),
261 (AllocationFunction.OfChar) SegmentAllocator::allocate,
262 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
263 scalarAllocations.add(new Object[] { 42, factory,
264 ValueLayout.JAVA_INT.withOrder(ByteOrder.BIG_ENDIAN),
265 (AllocationFunction.OfInt) SegmentAllocator::allocate,
266 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
267 scalarAllocations.add(new Object[] { 42f, factory, ValueLayout.JAVA_FLOAT.withOrder(ByteOrder.BIG_ENDIAN),
268 (AllocationFunction.OfFloat) SegmentAllocator::allocate,
269 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
270 scalarAllocations.add(new Object[] { 42L, factory, ValueLayout.JAVA_LONG.withOrder(ByteOrder.BIG_ENDIAN),
271 (AllocationFunction.OfLong) SegmentAllocator::allocate,
272 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
273 scalarAllocations.add(new Object[] { 42d, factory, ValueLayout.JAVA_DOUBLE.withOrder(ByteOrder.BIG_ENDIAN),
274 (AllocationFunction.OfDouble) SegmentAllocator::allocate,
275 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
276 scalarAllocations.add(new Object[] { MemorySegment.ofAddress(42), factory, ValueLayout.ADDRESS.withOrder(ByteOrder.BIG_ENDIAN),
277 (AllocationFunction.OfAddress) SegmentAllocator::allocate,
278 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
279
280 scalarAllocations.add(new Object[] { (short)42, factory, ValueLayout.JAVA_SHORT.withOrder(ByteOrder.LITTLE_ENDIAN),
281 (AllocationFunction.OfShort) SegmentAllocator::allocate,
282 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
283 scalarAllocations.add(new Object[] { (char)42, factory, ValueLayout.JAVA_CHAR.withOrder(ByteOrder.LITTLE_ENDIAN),
284 (AllocationFunction.OfChar) SegmentAllocator::allocate,
285 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
286 scalarAllocations.add(new Object[] { 42, factory,
287 ValueLayout.JAVA_INT.withOrder(ByteOrder.LITTLE_ENDIAN),
288 (AllocationFunction.OfInt) SegmentAllocator::allocate,
289 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
290 scalarAllocations.add(new Object[] { 42f, factory, ValueLayout.JAVA_FLOAT.withOrder(ByteOrder.LITTLE_ENDIAN),
291 (AllocationFunction.OfFloat) SegmentAllocator::allocate,
292 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
293 scalarAllocations.add(new Object[] { 42L, factory, ValueLayout.JAVA_LONG.withOrder(ByteOrder.LITTLE_ENDIAN),
294 (AllocationFunction.OfLong) SegmentAllocator::allocate,
295 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
296 scalarAllocations.add(new Object[] { 42d, factory, ValueLayout.JAVA_DOUBLE.withOrder(ByteOrder.LITTLE_ENDIAN),
297 (AllocationFunction.OfDouble) SegmentAllocator::allocate,
298 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
299 scalarAllocations.add(new Object[] { MemorySegment.ofAddress(42), factory, ValueLayout.ADDRESS.withOrder(ByteOrder.BIG_ENDIAN),
300 (AllocationFunction.OfAddress) SegmentAllocator::allocate,
301 (Function<MemoryLayout, VarHandle>)l -> l.varHandle() });
302 }
303 return scalarAllocations.toArray(Object[][]::new);
304 }
305
306 @DataProvider(name = "arrayAllocations")
307 static Object[][] arrayAllocations() {
308 List<Object[]> arrayAllocations = new ArrayList<>();
309 for (AllocationFactory factory : AllocationFactory.values()) {
310 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_BYTE,
311 (AllocationFunction.OfByteArray) SegmentAllocator::allocateArray,
312 ToArrayHelper.toByteArray });
313 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_CHAR.withOrder(ByteOrder.LITTLE_ENDIAN),
314 (AllocationFunction.OfCharArray) SegmentAllocator::allocateArray,
315 ToArrayHelper.toCharArray });
316 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_SHORT.withOrder(ByteOrder.LITTLE_ENDIAN),
317 (AllocationFunction.OfShortArray) SegmentAllocator::allocateArray,
318 ToArrayHelper.toShortArray });
319 arrayAllocations.add(new Object[] { factory,
320 ValueLayout.JAVA_INT.withOrder(ByteOrder.LITTLE_ENDIAN),
321 (AllocationFunction.OfIntArray) SegmentAllocator::allocateArray,
322 ToArrayHelper.toIntArray });
323 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_FLOAT.withOrder(ByteOrder.LITTLE_ENDIAN),
324 (AllocationFunction.OfFloatArray) SegmentAllocator::allocateArray,
325 ToArrayHelper.toFloatArray });
326 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_LONG.withOrder(ByteOrder.LITTLE_ENDIAN),
327 (AllocationFunction.OfLongArray) SegmentAllocator::allocateArray,
328 ToArrayHelper.toLongArray });
329 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_DOUBLE.withOrder(ByteOrder.LITTLE_ENDIAN),
330 (AllocationFunction.OfDoubleArray) SegmentAllocator::allocateArray,
331 ToArrayHelper.toDoubleArray });
332
333 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_CHAR.withOrder(ByteOrder.BIG_ENDIAN),
334 (AllocationFunction.OfCharArray) SegmentAllocator::allocateArray,
335 ToArrayHelper.toCharArray });
336 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_SHORT.withOrder(ByteOrder.BIG_ENDIAN),
337 (AllocationFunction.OfShortArray) SegmentAllocator::allocateArray,
338 ToArrayHelper.toShortArray });
339 arrayAllocations.add(new Object[] { factory,
340 ValueLayout.JAVA_INT.withOrder(ByteOrder.BIG_ENDIAN),
341 (AllocationFunction.OfIntArray) SegmentAllocator::allocateArray,
342 ToArrayHelper.toIntArray });
343 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_FLOAT.withOrder(ByteOrder.BIG_ENDIAN),
344 (AllocationFunction.OfFloatArray) SegmentAllocator::allocateArray,
345 ToArrayHelper.toFloatArray });
346 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_LONG.withOrder(ByteOrder.BIG_ENDIAN),
347 (AllocationFunction.OfLongArray) SegmentAllocator::allocateArray,
348 ToArrayHelper.toLongArray });
349 arrayAllocations.add(new Object[] { factory, ValueLayout.JAVA_DOUBLE.withOrder(ByteOrder.BIG_ENDIAN),
350 (AllocationFunction.OfDoubleArray) SegmentAllocator::allocateArray,
351 ToArrayHelper.toDoubleArray });
352 };
353 return arrayAllocations.toArray(Object[][]::new);
354 }
355
356 interface AllocationFunction<X, L extends ValueLayout> {
357 MemorySegment allocate(SegmentAllocator allocator, L layout, X value);
358
359 interface OfByte extends AllocationFunction<Byte, ValueLayout.OfByte> { }
360 interface OfBoolean extends AllocationFunction<Boolean, ValueLayout.OfBoolean> { }
361 interface OfChar extends AllocationFunction<Character, ValueLayout.OfChar> { }
362 interface OfShort extends AllocationFunction<Short, ValueLayout.OfShort> { }
363 interface OfInt extends AllocationFunction<Integer, ValueLayout.OfInt> { }
364 interface OfFloat extends AllocationFunction<Float, ValueLayout.OfFloat> { }
365 interface OfLong extends AllocationFunction<Long, ValueLayout.OfLong> { }
366 interface OfDouble extends AllocationFunction<Double, ValueLayout.OfDouble> { }
367 interface OfAddress extends AllocationFunction<MemorySegment, AddressLayout> { }
368
369 interface OfByteArray extends AllocationFunction<byte[], ValueLayout.OfByte> { }
370 interface OfCharArray extends AllocationFunction<char[], ValueLayout.OfChar> { }
371 interface OfShortArray extends AllocationFunction<short[], ValueLayout.OfShort> { }
372 interface OfIntArray extends AllocationFunction<int[], ValueLayout.OfInt> { }
373 interface OfFloatArray extends AllocationFunction<float[], ValueLayout.OfFloat> { }
374 interface OfLongArray extends AllocationFunction<long[], ValueLayout.OfLong> { }
375 interface OfDoubleArray extends AllocationFunction<double[], ValueLayout.OfDouble> { }
376 }
377
378 enum AllocationFactory {
379 SLICING(true, (size, arena) -> {
380 return SegmentAllocator.slicingAllocator(arena.allocate(size, 1));
381 });
382
383 private final boolean isBound;
384 private final BiFunction<Long, Arena, SegmentAllocator> factory;
385
386 AllocationFactory(boolean isBound, BiFunction<Long, Arena, SegmentAllocator> factory) {
387 this.isBound = isBound;
388 this.factory = factory;
389 }
390
391 SegmentAllocator allocator(long size, Arena arena) {
392 return factory.apply(size, arena);
393 }
394
395 public boolean isBound() {
396 return isBound;
397 }
398 }
399
400 interface ToArrayHelper<T> {
401 T array();
402 T toArray(MemorySegment segment, ValueLayout layout);
403
404 ToArrayHelper<byte[]> toByteArray = new ToArrayHelper<>() {
405 @Override
406 public byte[] array() {
407 return new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
408 }
409
410 @Override
411 public byte[] toArray(MemorySegment segment, ValueLayout layout) {
412 ByteBuffer buffer = segment.asByteBuffer().order(layout.order());
413 byte[] found = new byte[buffer.limit()];
414 buffer.get(found);
415 return found;
416 }
417 };
418
419 ToArrayHelper<char[]> toCharArray = new ToArrayHelper<>() {
420 @Override
421 public char[] array() {
422 return new char[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
423 }
424
425 @Override
426 public char[] toArray(MemorySegment segment, ValueLayout layout) {
427 CharBuffer buffer = segment.asByteBuffer().order(layout.order()).asCharBuffer();
428 char[] found = new char[buffer.limit()];
429 buffer.get(found);
430 return found;
431 }
432 };
433
434 ToArrayHelper<short[]> toShortArray = new ToArrayHelper<>() {
435 @Override
436 public short[] array() {
437 return new short[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
438 }
439
440 @Override
441 public short[] toArray(MemorySegment segment, ValueLayout layout) {
442 ShortBuffer buffer = segment.asByteBuffer().order(layout.order()).asShortBuffer();
443 short[] found = new short[buffer.limit()];
444 buffer.get(found);
445 return found;
446 }
447 };
448
449 ToArrayHelper<int[]> toIntArray = new ToArrayHelper<>() {
450 @Override
451 public int[] array() {
452 return new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
453 }
454
455 @Override
456 public int[] toArray(MemorySegment segment, ValueLayout layout) {
457 IntBuffer buffer = segment.asByteBuffer().order(layout.order()).asIntBuffer();
458 int[] found = new int[buffer.limit()];
459 buffer.get(found);
460 return found;
461 }
462 };
463
464 ToArrayHelper<float[]> toFloatArray = new ToArrayHelper<>() {
465 @Override
466 public float[] array() {
467 return new float[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
468 }
469
470 @Override
471 public float[] toArray(MemorySegment segment, ValueLayout layout) {
472 FloatBuffer buffer = segment.asByteBuffer().order(layout.order()).asFloatBuffer();
473 float[] found = new float[buffer.limit()];
474 buffer.get(found);
475 return found;
476 }
477 };
478
479 ToArrayHelper<long[]> toLongArray = new ToArrayHelper<>() {
480 @Override
481 public long[] array() {
482 return new long[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
483 }
484
485 @Override
486 public long[] toArray(MemorySegment segment, ValueLayout layout) {
487 LongBuffer buffer = segment.asByteBuffer().order(layout.order()).asLongBuffer();
488 long[] found = new long[buffer.limit()];
489 buffer.get(found);
490 return found;
491 }
492 };
493
494 ToArrayHelper<double[]> toDoubleArray = new ToArrayHelper<>() {
495 @Override
496 public double[] array() {
497 return new double[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
498 }
499
500 @Override
501 public double[] toArray(MemorySegment segment, ValueLayout layout) {
502 DoubleBuffer buffer = segment.asByteBuffer().order(layout.order()).asDoubleBuffer();
503 double[] found = new double[buffer.limit()];
504 buffer.get(found);
505 return found;
506 }
507 };
508 }
509
510 @DataProvider(name = "allocators")
511 static Object[][] allocators() {
512 return new Object[][] {
513 { SegmentAllocator.prefixAllocator(Arena.global().allocate(10, 1)) },
514 };
515 }
516 }