1 /* 2 * Copyright (c) 2002, 2018, 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 * 27 * @summary converted from VM Testbase runtime/jbe/dead/dead05. 28 * VM Testbase keywords: [quick, runtime] 29 * 30 * @library /vmTestbase 31 * /test/lib 32 * @run driver jdk.test.lib.FileInstaller . . 33 * @run main/othervm vm.compiler.jbe.dead.dead05.dead05 34 */ 35 36 package vm.compiler.jbe.dead.dead05; 37 38 /* -- Test the elimination of dead assignment to static class field 39 In the example below, all the values assigned to i in struct except of the last one are never used,thus can be eliminated. 40 41 */ 42 43 class struct { 44 static int i = 6; 45 } 46 47 public class dead05 { 48 main(String args[])49 public static void main(String args[]) { 50 dead05 dce = new dead05(); 51 52 System.out.println("f()="+dce.f()+"; fopt()="+dce.fopt()); 53 if (dce.f() == dce.fopt()) { 54 System.out.println("Test dead05 Passed."); 55 } else { 56 throw new Error("Test dead05 Failed: f()=" + dce.f() + " != fopt()=" + dce.fopt()); 57 } 58 } 59 f()60 int f() { 61 62 struct.i = 1; 63 struct.i = 2; 64 struct.i = 3; 65 struct.i = 4; 66 struct.i = 5; 67 struct.i = 6; 68 struct.i = 7; 69 struct.i = 8; 70 71 struct.i = 1; 72 struct.i = 2; 73 struct.i = 3; 74 struct.i = 4; 75 struct.i = 5; 76 struct.i = 6; 77 struct.i = 7; 78 struct.i = 8; 79 80 struct.i = 1; 81 struct.i = 2; 82 struct.i = 3; 83 struct.i = 4; 84 struct.i = 5; 85 struct.i = 6; 86 struct.i = 7; 87 struct.i = 8; 88 89 return struct.i; 90 } 91 92 // Code fragment after dead code elimination fopt()93 int fopt() { 94 95 struct.i = 8; 96 return struct.i; 97 } 98 } 99