1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/tools/javac/T8022186/DeadCodeGeneratedForEmptyTryTest.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,166 @@
1.4 +/*
1.5 + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/*
1.30 + * @test
1.31 + * @bug 8022186
1.32 + * @summary javac generates dead code if a try with an empty body has a finalizer
1.33 + */
1.34 +
1.35 +import com.sun.tools.classfile.Attribute;
1.36 +import com.sun.tools.classfile.ClassFile;
1.37 +import com.sun.tools.classfile.Code_attribute;
1.38 +import com.sun.tools.classfile.ConstantPool;
1.39 +import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info;
1.40 +import com.sun.tools.classfile.ConstantPool.CPInfo;
1.41 +import com.sun.tools.classfile.ConstantPool.InvalidIndex;
1.42 +import com.sun.tools.classfile.Instruction;
1.43 +import com.sun.tools.classfile.Instruction.KindVisitor;
1.44 +import com.sun.tools.classfile.Instruction.TypeKind;
1.45 +import com.sun.tools.classfile.Method;
1.46 +import com.sun.tools.javac.util.Assert;
1.47 +import java.io.BufferedInputStream;
1.48 +import java.nio.file.Files;
1.49 +import java.nio.file.Path;
1.50 +import java.nio.file.Paths;
1.51 +
1.52 +public class DeadCodeGeneratedForEmptyTryTest {
1.53 +
1.54 + public static void main(String[] args) throws Exception {
1.55 + new DeadCodeGeneratedForEmptyTryTest().run();
1.56 + }
1.57 +
1.58 + void run() throws Exception {
1.59 + checkClassFile(Paths.get(System.getProperty("test.classes"),
1.60 + this.getClass().getName() + "$Test.class"));
1.61 + }
1.62 +
1.63 + int utf8Index;
1.64 + int numberOfRefToStr = 0;
1.65 + ConstantPool constantPool;
1.66 +
1.67 + void checkClassFile(final Path path) throws Exception {
1.68 + ClassFile classFile = ClassFile.read(
1.69 + new BufferedInputStream(Files.newInputStream(path)));
1.70 + constantPool = classFile.constant_pool;
1.71 + utf8Index = constantPool.getUTF8Index("STR_TO_LOOK_FOR");
1.72 + for (Method method: classFile.methods) {
1.73 + if (method.getName(constantPool).equals("methodToLookFor")) {
1.74 + Code_attribute codeAtt = (Code_attribute)method.attributes.get(Attribute.Code);
1.75 + for (Instruction inst: codeAtt.getInstructions()) {
1.76 + inst.accept(codeVisitor, null);
1.77 + }
1.78 + }
1.79 + }
1.80 + Assert.check(numberOfRefToStr == 1,
1.81 + "There should only be one reference to a CONSTANT_String_info structure in the generated code");
1.82 + }
1.83 +
1.84 + CodeVisitor codeVisitor = new CodeVisitor();
1.85 +
1.86 + class CodeVisitor implements KindVisitor<Void, Void> {
1.87 +
1.88 + void checkIndirectRefToString(int cp_index) {
1.89 + try {
1.90 + CPInfo cInfo = constantPool.get(cp_index);
1.91 + if (cInfo instanceof CONSTANT_String_info) {
1.92 + CONSTANT_String_info strInfo = (CONSTANT_String_info)cInfo;
1.93 + if (strInfo.string_index == utf8Index) {
1.94 + numberOfRefToStr++;
1.95 + }
1.96 + }
1.97 + } catch (InvalidIndex ex) {
1.98 + throw new AssertionError("invalid constant pool index at " + cp_index);
1.99 + }
1.100 + }
1.101 +
1.102 + @Override
1.103 + public Void visitNoOperands(Instruction instr, Void p) {
1.104 + return null;
1.105 + }
1.106 +
1.107 + @Override
1.108 + public Void visitArrayType(Instruction instr, TypeKind kind, Void p) {
1.109 + return null;
1.110 + }
1.111 +
1.112 + @Override
1.113 + public Void visitBranch(Instruction instr, int offset, Void p) {
1.114 + return null;
1.115 + }
1.116 +
1.117 + @Override
1.118 + public Void visitConstantPoolRef(Instruction instr, int index, Void p) {
1.119 + checkIndirectRefToString(index);
1.120 + return null;
1.121 + }
1.122 +
1.123 + @Override
1.124 + public Void visitConstantPoolRefAndValue(Instruction instr, int index, int value, Void p) {
1.125 + checkIndirectRefToString(index);
1.126 + return null;
1.127 + }
1.128 +
1.129 + @Override
1.130 + public Void visitLocal(Instruction instr, int index, Void p) {
1.131 + return null;
1.132 + }
1.133 +
1.134 + @Override
1.135 + public Void visitLocalAndValue(Instruction instr, int index, int value, Void p) {
1.136 + return null;
1.137 + }
1.138 +
1.139 + @Override
1.140 + public Void visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, Void p) {
1.141 + return null;
1.142 + }
1.143 +
1.144 + @Override
1.145 + public Void visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, Void p) {
1.146 + return null;
1.147 + }
1.148 +
1.149 + @Override
1.150 + public Void visitValue(Instruction instr, int value, Void p) {
1.151 + return null;
1.152 + }
1.153 +
1.154 + @Override
1.155 + public Void visitUnknown(Instruction instr, Void p) {
1.156 + return null;
1.157 + }
1.158 +
1.159 + }
1.160 +
1.161 + public class Test {
1.162 + void methodToLookFor() {
1.163 + try {
1.164 + } finally {
1.165 + System.out.println("STR_TO_LOOK_FOR");
1.166 + }
1.167 + }
1.168 + }
1.169 +}
