1 /* 2 * Copyright (c) 2024, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package wrap; 26 27 import java.lang.foreign.MemoryLayout; 28 import java.lang.foreign.MemorySegment; 29 import java.lang.invoke.VarHandle; 30 31 public record Scalar(String name, MemorySegment memorySegment, 32 VarHandle varHandle) { 33 34 public static Scalar of(MemorySegment memorySegment, MemoryLayout memoryLayout, String name) { 35 return of(memorySegment, memoryLayout, MemoryLayout.PathElement.groupElement(name)); 36 } 37 38 public static Scalar of(MemorySegment memorySegment, MemoryLayout memoryLayout, String name, Object initial) { 39 return of(memorySegment, memoryLayout, name).set(initial); 40 } 41 42 public static Scalar of(MemorySegment memorySegment, MemoryLayout memoryLayout, 43 MemoryLayout.PathElement... pathElements) { 44 VarHandle vh = memoryLayout.varHandle(pathElements); 45 String name = null; 46 for (int i = 0; i < pathElements.length; i++) { 47 MemoryLayout.PathElement pathElement = pathElements[i]; 48 // Why can't I access LayoutPath? 49 if (pathElement.toString().isEmpty()) { 50 name = pathElement.toString(); 51 } 52 } 53 return new Scalar(name, memorySegment, vh); 54 55 } 56 57 public Scalar set(Object o) { 58 varHandle.set(memorySegment, 0, o); 59 return this; 60 } 61 62 public Object get() { 63 return varHandle.get(memorySegment, 0); 64 } 65 66 public int i32() { 67 return (int) get(); 68 } 69 70 public long i64() { 71 return (long) get(); 72 } 73 74 public float f32() { 75 return (float) get(); 76 } 77 78 public double f64() { 79 return (double) get(); 80 } 81 }