110 lines
4.3 KiB
Java
110 lines
4.3 KiB
Java
/*
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8134759
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* @summary Add LineNumberTable attribute for return bytecodes split around finally code
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* @enablePreview
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*/
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.*;
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import java.io.IOException;
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import java.util.List;
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public class FinallyLineNumberTest {
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public static void main(String[] args) throws Exception {
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// check that we have 5 consecutive entries for method()
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List<LineNumberInfo> lines = findEntries();
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if (lines == null) {
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throw new Exception("finally line number table could not be loaded");
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}
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if (lines.size() != 5) {
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// Help debug
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System.err.println("LineTable error, got lines:");
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for (LineNumberInfo e : lines) {
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System.err.println(e.lineNumber());
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}
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throw new Exception("finally line number table incorrect: length=" + lines.size() + " expected length=5");
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}
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// return null line, for the load null operation
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int current = lines.get(0).lineNumber();
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int first = current;
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// finally line
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current = lines.get(1).lineNumber();
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if (current != first + 2) {
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throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
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}
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// return null line, for the return operation
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current = lines.get(2).lineNumber();
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if (current != first) {
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throw new Exception("finally line number table incorrect: got=" + current + " expected=" + first);
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}
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// for when exception is thrown
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current = lines.get(3).lineNumber();
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if (current != first + 2) {
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throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
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}
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// the '}' closing the finally block
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current = lines.get(4).lineNumber();
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if (current != first + 3) {
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throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 3));
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}
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}
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static List<LineNumberInfo> findEntries() throws IOException {
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ClassModel self = ClassFile.of().parse(FinallyLineNumberTest.class.getResourceAsStream("FinallyLineNumberTest.class").readAllBytes());
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for (MethodModel m : self.methods()) {
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if (m.methodName().equalsString("method")) {
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CodeAttribute code_attribute = m.findAttribute(Attributes.code()).orElseThrow();
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for (Attribute<?> at : code_attribute.attributes()) {
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if (at instanceof LineNumberTableAttribute lineAt) {
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return lineAt.lineNumbers();
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}
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}
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}
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}
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return null;
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}
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// This method should get LineNumberTable entries for:
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// *) The load of the null
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// *) The finally code for when an exception is *not* thrown
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// *) The actual return, which should have the same line as the load of the null
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// *) The finally code for when an exception *is* thrown, should have the same line as above finally code
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public static String method(int field) {
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try {
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return null;
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} finally {
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field+=1; // Dummy
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}
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}
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}
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