1/* 2 * Copyright (c) 2016, 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 */ 23package org.graalvm.compiler.replacements.test; 24 25import org.graalvm.compiler.core.test.GraalCompilerTest; 26import org.graalvm.compiler.nodes.ConstantNode; 27import org.graalvm.compiler.nodes.FixedNode; 28import org.graalvm.compiler.nodes.ReturnNode; 29import org.graalvm.compiler.nodes.StructuredGraph; 30import org.graalvm.compiler.nodes.ValueNode; 31import jdk.vm.ci.meta.JavaConstant; 32import org.junit.Test; 33 34import jdk.vm.ci.meta.ResolvedJavaMethod; 35import static org.hamcrest.CoreMatchers.instanceOf; 36import org.junit.Assert; 37 38/** 39 * Tests constant folding of {@link String#hashCode()}. 40 */ 41public class StringHashConstantTest extends GraalCompilerTest { 42 43 private static final String A_CONSTANT_STRING = "a constant string"; 44 45 private ValueNode asConstant(StructuredGraph graph, String str) { 46 return ConstantNode.forConstant(getSnippetReflection().forObject(str), getMetaAccess(), graph); 47 } 48 49 @Test 50 public void test1() { 51 ResolvedJavaMethod method = getResolvedJavaMethod("parameterizedHashCode"); 52 StructuredGraph graph = parseForCompile(method); 53 54 String s = "some string"; 55 int expected = s.hashCode(); 56 graph.getParameter(0).replaceAndDelete(asConstant(graph, s)); 57 58 compile(method, graph); 59 60 FixedNode firstFixed = graph.start().next(); 61 Assert.assertThat(firstFixed, instanceOf(ReturnNode.class)); 62 63 ReturnNode ret = (ReturnNode) firstFixed; 64 JavaConstant result = ret.result().asJavaConstant(); 65 if (result == null) { 66 Assert.fail("result not constant: " + ret.result()); 67 } else { 68 Assert.assertEquals("result", expected, result.asInt()); 69 } 70 } 71 72 public static int parameterizedHashCode(String value) { 73 return value.hashCode(); 74 } 75 76 @Test 77 public void test2() { 78 ResolvedJavaMethod method = getResolvedJavaMethod("constantHashCode"); 79 StructuredGraph graph = parseForCompile(method); 80 81 FixedNode firstFixed = graph.start().next(); 82 Assert.assertThat(firstFixed, instanceOf(ReturnNode.class)); 83 84 ReturnNode ret = (ReturnNode) firstFixed; 85 JavaConstant result = ret.result().asJavaConstant(); 86 if (result == null) { 87 Assert.fail("result not constant: " + ret.result()); 88 } else { 89 int expected = A_CONSTANT_STRING.hashCode(); 90 Assert.assertEquals("result", expected, result.asInt()); 91 } 92 } 93 94 public static int constantHashCode() { 95 return A_CONSTANT_STRING.hashCode(); 96 } 97} 98