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 TestUninitializedVariable 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.analysis.SSA; 34 import jdk.incubator.code.dialect.core.CoreOp; 35 import jdk.incubator.code.interpreter.Interpreter; 36 import org.junit.jupiter.api.Assertions; 37 import org.junit.jupiter.params.ParameterizedTest; 38 import org.junit.jupiter.params.provider.MethodSource; 39 40 import java.lang.invoke.MethodHandles; 41 import java.lang.reflect.Method; 42 import java.util.Optional; 43 import java.util.concurrent.atomic.AtomicBoolean; 44 import java.util.stream.Stream; 45 46 public class TestUninitializedVariable { 47 48 @CodeReflection 49 static int simple(int i) { 50 int x; 51 x = i; // drop store 52 return x; 53 } 54 55 @CodeReflection 56 static int controlFlow(int i) { 57 int x; 58 if (i > 0) { 59 x = i; // drop store 60 } else { 61 x = -i; 62 } 63 return x; 64 } 65 66 static Stream<String> methods() { 67 return Stream.of("simple", "controlFlow"); 68 } 69 70 @ParameterizedTest 71 @MethodSource("methods") 72 public void testInterpret(String method) { 73 CoreOp.FuncOp f = removeFirstStore(getFuncOp(method).transform(OpTransformer.LOWERING_TRANSFORMER)); 74 System.out.println(f.toText()); 75 76 Assertions.assertThrows(Interpreter.InterpreterException.class, () -> Interpreter.invoke(MethodHandles.lookup(), f, 1)); 77 } 78 79 @ParameterizedTest 80 @MethodSource("methods") 81 public void testSSA(String method) { 82 CoreOp.FuncOp f = removeFirstStore(getFuncOp(method).transform(OpTransformer.LOWERING_TRANSFORMER)); 83 System.out.println(f.toText()); 84 85 Assertions.assertThrows(IllegalStateException.class, () -> SSA.transform(f)); 86 } 87 88 static CoreOp.FuncOp removeFirstStore(CoreOp.FuncOp f) { 89 AtomicBoolean b = new AtomicBoolean(); 90 return f.transform((block, op) -> { 91 if (op instanceof CoreOp.VarAccessOp.VarStoreOp vop && !b.getAndSet(true)) { 92 // Drop first encountered var store 93 } else { 94 block.op(op); 95 } 96 return block; 97 }); 98 } 99 100 static CoreOp.FuncOp getFuncOp(String name) { 101 Optional<Method> om = Stream.of(TestUninitializedVariable.class.getDeclaredMethods()) 102 .filter(m -> m.getName().equals(name)) 103 .findFirst(); 104 105 Method m = om.get(); 106 return Op.ofMethod(m).get(); 107 } 108 }