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. 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 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @run testng TestNestedCapturingLambda 27 */ 28 29 import org.testng.Assert; 30 import org.testng.annotations.Test; 31 32 import java.lang.invoke.MethodHandle; 33 import java.lang.invoke.MethodHandles; 34 import java.lang.reflect.Method; 35 import java.lang.reflect.code.OpTransformer; 36 import java.lang.reflect.code.Quotable; 37 import java.lang.reflect.code.bytecode.BytecodeGenerator; 38 import java.lang.reflect.code.op.CoreOp; 39 import java.lang.runtime.CodeReflection; 40 import java.util.Optional; 41 import java.util.function.IntSupplier; 42 import java.util.stream.Stream; 43 44 public class TestNestedCapturingLambda { 45 46 @FunctionalInterface 47 interface QIntSupplier extends IntSupplier, Quotable { 48 } 49 50 @CodeReflection 51 static public int f(int a) { 52 if (a > 0) { 53 QIntSupplier s = () -> a; 54 test(s, a); 55 return s.getAsInt(); 56 } else { 57 return 0; 58 } 59 } 60 61 static void test(QIntSupplier s, int a) { 62 @SuppressWarnings("unchecked") 63 CoreOp.Var<Integer> capture = (CoreOp.Var<Integer>) s.quoted().capturedValues().values().iterator().next(); 64 Assert.assertEquals(capture.value().intValue(), a); 65 } 66 67 @Test 68 public void testf() throws Throwable { 69 CoreOp.FuncOp f = getFuncOp("f"); 70 71 MethodHandle mh = generate(f); 72 73 Assert.assertEquals((int) mh.invoke(42), f(42)); 74 Assert.assertEquals((int) mh.invoke(-1), f(-1)); 75 } 76 77 static MethodHandle generate(CoreOp.FuncOp f) { 78 f.writeTo(System.out); 79 80 CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER); 81 lf.writeTo(System.out); 82 83 return BytecodeGenerator.generate(MethodHandles.lookup(), lf); 84 } 85 86 static CoreOp.FuncOp getFuncOp(String name) { 87 Optional<Method> om = Stream.of(TestNestedCapturingLambda.class.getDeclaredMethods()) 88 .filter(m -> m.getName().equals(name)) 89 .findFirst(); 90 91 Method m = om.get(); 92 return m.getCodeModel().get(); 93 } 94 }