NativeTestHelper.java

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 *  DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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import jdk.incubator.foreign.CLinker;
import jdk.incubator.foreign.MemoryLayout;
import jdk.incubator.foreign.MemorySegment;
import jdk.incubator.foreign.ResourceScope;
import jdk.incubator.foreign.SegmentAllocator;

public class NativeTestHelper {

    static CLinker.TypeKind kind(MemoryLayout layout) {
        return (CLinker.TypeKind)layout.attribute(CLinker.TypeKind.ATTR_NAME).orElseThrow(
                () -> new IllegalStateException("Unexpected value layout: could not determine ABI class"));
    }

    public static boolean isIntegral(MemoryLayout layout) {
        return kind(layout).isIntegral();
    }

    public static boolean isPointer(MemoryLayout layout) {
        return kind(layout).isPointer();
    }

    public static class NativeScope implements SegmentAllocator, AutoCloseable {
        final ResourceScope resourceScope;
        final ResourceScope.Handle scopeHandle;
        final SegmentAllocator allocator;

        long allocatedBytes = 0;

        public NativeScope() {
            this.resourceScope = ResourceScope.newConfinedScope();
            this.scopeHandle = resourceScope.acquire();
            this.allocator = SegmentAllocator.arenaAllocator(resourceScope);
        }

        @Override
        public MemorySegment allocate(long bytesSize, long bytesAlignment) {
            allocatedBytes += bytesSize;
            return allocator.allocate(bytesSize, bytesAlignment);
        }

        public ResourceScope scope() {
            return resourceScope;
        }

        public long allocatedBytes() {
            return allocatedBytes;
        }

        @Override
        public void close() {
            resourceScope.release(scopeHandle);
            resourceScope.close();
        }
    }
}