1 /* 2 * Copyright (c) 2019, 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 package org.graalvm.compiler.hotspot.test; 26 27 import org.graalvm.compiler.core.test.GraalCompilerTest; 28 import org.graalvm.compiler.nodes.ConstantNode; 29 import org.graalvm.compiler.nodes.FixedNode; 30 import org.graalvm.compiler.nodes.ReturnNode; 31 import org.graalvm.compiler.nodes.StructuredGraph; 32 import org.junit.Test; 33 34 import jdk.vm.ci.hotspot.HotSpotObjectConstant; 35 import jdk.vm.ci.meta.Constant; 36 import jdk.vm.ci.meta.ResolvedJavaMethod; 37 import static org.hamcrest.CoreMatchers.instanceOf; 38 import org.junit.Assert; 39 40 /** 41 * Tests constant folding of {@link String#intern()}. 42 */ 43 public class StringInternConstantTest extends GraalCompilerTest { 44 45 private static final String A_CONSTANT_STRING = "a constant string"; 46 47 @Test 48 public void test1() { 49 ResolvedJavaMethod method = getResolvedJavaMethod("constantIntern"); 50 StructuredGraph graph = parseForCompile(method); 51 52 FixedNode firstFixed = graph.start().next(); 53 Assert.assertThat(firstFixed, instanceOf(ReturnNode.class)); 54 55 ReturnNode ret = (ReturnNode) firstFixed; 56 if (ret.result() instanceof ConstantNode) { 57 String expected = A_CONSTANT_STRING.intern(); 58 Constant constant = ((ConstantNode) ret.result()).getValue(); 59 if (constant instanceof HotSpotObjectConstant) { 60 String returnedString = ((HotSpotObjectConstant) constant).asObject(String.class); 61 Assert.assertSame("result", expected, returnedString); 62 } else { 63 Assert.fail("expected HotSpotObjectConstant, got: " + constant.getClass()); 64 } 65 } else { 66 Assert.fail("result not constant: " + ret.result()); 67 } 68 } 69 70 public static String constantIntern() { 71 return A_CONSTANT_STRING.intern(); 72 } 73 }