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