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 * @modules jdk.incubator.code 27 * @run junit TestNestedCapturingLambda 28 */ 29 30 import jdk.incubator.code.CodeReflection; 31 import jdk.incubator.code.Op; 32 import jdk.incubator.code.OpTransformer; 33 import jdk.incubator.code.Quotable; 34 import jdk.incubator.code.bytecode.BytecodeGenerator; 35 import jdk.incubator.code.dialect.core.CoreOp; 36 import org.junit.jupiter.api.Assertions; 37 import org.junit.jupiter.api.Test; 38 39 import java.lang.invoke.MethodHandle; 40 import java.lang.invoke.MethodHandles; 41 import java.lang.reflect.Method; 42 import java.util.Optional; 43 import java.util.function.IntSupplier; 44 import java.util.stream.Stream; 45 46 public class TestNestedCapturingLambda { 47 48 @FunctionalInterface 49 interface QIntSupplier extends IntSupplier, Quotable { 50 } 51 52 @CodeReflection 53 static public int f(int a) { 54 if (a > 0) { 55 QIntSupplier s = () -> a; 56 test(s, a); 57 return s.getAsInt(); 58 } else { 59 return 0; 60 } 61 } 62 63 static void test(QIntSupplier s, int a) { 64 @SuppressWarnings("unchecked") 65 CoreOp.Var<Integer> capture = (CoreOp.Var<Integer>) Op.ofQuotable(s).get().capturedValues().values().iterator().next(); 66 Assertions.assertEquals(a, capture.value().intValue()); 67 } 68 69 @Test 70 public void testf() throws Throwable { 71 CoreOp.FuncOp f = getFuncOp("f"); 72 73 MethodHandle mh = generate(f); 74 75 Assertions.assertEquals(f(42), (int) mh.invoke(42)); 76 Assertions.assertEquals(f(-1), (int) mh.invoke(-1)); 77 } 78 79 static MethodHandle generate(CoreOp.FuncOp f) { 80 System.out.println(f.toText()); 81 82 CoreOp.FuncOp lf = f.transform(OpTransformer.LOWERING_TRANSFORMER); 83 System.out.println(lf.toText()); 84 85 return BytecodeGenerator.generate(MethodHandles.lookup(), lf); 86 } 87 88 static CoreOp.FuncOp getFuncOp(String name) { 89 Optional<Method> om = Stream.of(TestNestedCapturingLambda.class.getDeclaredMethods()) 90 .filter(m -> m.getName().equals(name)) 91 .findFirst(); 92 93 Method m = om.get(); 94 return Op.ofMethod(m).get(); 95 } 96 }