| /* |
| * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8022186 |
| * @summary javac generates dead code if a try with an empty body has a finalizer |
| * @modules jdk.jdeps/com.sun.tools.classfile |
| * jdk.compiler/com.sun.tools.javac.util |
| */ |
| |
| import com.sun.tools.classfile.Attribute; |
| import com.sun.tools.classfile.ClassFile; |
| import com.sun.tools.classfile.Code_attribute; |
| import com.sun.tools.classfile.ConstantPool; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info; |
| import com.sun.tools.classfile.ConstantPool.CPInfo; |
| import com.sun.tools.classfile.ConstantPool.InvalidIndex; |
| import com.sun.tools.classfile.Instruction; |
| import com.sun.tools.classfile.Instruction.KindVisitor; |
| import com.sun.tools.classfile.Instruction.TypeKind; |
| import com.sun.tools.classfile.Method; |
| import com.sun.tools.javac.util.Assert; |
| import java.io.BufferedInputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| |
| public class DeadCodeGeneratedForEmptyTryTest { |
| |
| public static void main(String[] args) throws Exception { |
| new DeadCodeGeneratedForEmptyTryTest().run(); |
| } |
| |
| void run() throws Exception { |
| checkClassFile(Paths.get(System.getProperty("test.classes"), |
| this.getClass().getName() + "$Test.class")); |
| } |
| |
| int utf8Index; |
| int numberOfRefToStr = 0; |
| ConstantPool constantPool; |
| |
| void checkClassFile(final Path path) throws Exception { |
| ClassFile classFile = ClassFile.read( |
| new BufferedInputStream(Files.newInputStream(path))); |
| constantPool = classFile.constant_pool; |
| utf8Index = constantPool.getUTF8Index("STR_TO_LOOK_FOR"); |
| for (Method method: classFile.methods) { |
| if (method.getName(constantPool).equals("methodToLookFor")) { |
| Code_attribute codeAtt = (Code_attribute)method.attributes.get(Attribute.Code); |
| for (Instruction inst: codeAtt.getInstructions()) { |
| inst.accept(codeVisitor, null); |
| } |
| } |
| } |
| Assert.check(numberOfRefToStr == 1, |
| "There should only be one reference to a CONSTANT_String_info structure in the generated code"); |
| } |
| |
| CodeVisitor codeVisitor = new CodeVisitor(); |
| |
| class CodeVisitor implements KindVisitor<Void, Void> { |
| |
| void checkIndirectRefToString(int cp_index) { |
| try { |
| CPInfo cInfo = constantPool.get(cp_index); |
| if (cInfo instanceof CONSTANT_String_info) { |
| CONSTANT_String_info strInfo = (CONSTANT_String_info)cInfo; |
| if (strInfo.string_index == utf8Index) { |
| numberOfRefToStr++; |
| } |
| } |
| } catch (InvalidIndex ex) { |
| throw new AssertionError("invalid constant pool index at " + cp_index); |
| } |
| } |
| |
| @Override |
| public Void visitNoOperands(Instruction instr, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitArrayType(Instruction instr, TypeKind kind, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitBranch(Instruction instr, int offset, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitConstantPoolRef(Instruction instr, int index, Void p) { |
| checkIndirectRefToString(index); |
| return null; |
| } |
| |
| @Override |
| public Void visitConstantPoolRefAndValue(Instruction instr, int index, int value, Void p) { |
| checkIndirectRefToString(index); |
| return null; |
| } |
| |
| @Override |
| public Void visitLocal(Instruction instr, int index, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitLocalAndValue(Instruction instr, int index, int value, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitValue(Instruction instr, int value, Void p) { |
| return null; |
| } |
| |
| @Override |
| public Void visitUnknown(Instruction instr, Void p) { |
| return null; |
| } |
| |
| } |
| |
| public class Test { |
| void methodToLookFor() { |
| try { |
| } finally { |
| System.out.println("STR_TO_LOOK_FOR"); |
| } |
| } |
| } |
| } |