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/*
* Copyright (c) 2015, 2024, 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 8134759
* @summary Add LineNumberTable attribute for return bytecodes split around finally code
*/
import java.lang.classfile.*;
import java.lang.classfile.attribute.*;
import java.io.IOException;
import java.util.List;
public class FinallyLineNumberTest {
public static void main(String[] args) throws Exception {
// check that we have 5 consecutive entries for method()
List<LineNumberInfo> lines = findEntries();
if (lines == null) {
throw new Exception("finally line number table could not be loaded");
}
if (lines.size() != 5) {
// Help debug
System.err.println("LineTable error, got lines:");
for (LineNumberInfo e : lines) {
System.err.println(e.lineNumber());
}
throw new Exception("finally line number table incorrect: length=" + lines.size() + " expected length=5");
}
// return null line, for the load null operation
int current = lines.get(0).lineNumber();
int first = current;
// finally line
current = lines.get(1).lineNumber();
if (current != first + 2) {
throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
}
// return null line, for the return operation
current = lines.get(2).lineNumber();
if (current != first) {
throw new Exception("finally line number table incorrect: got=" + current + " expected=" + first);
}
// for when exception is thrown
current = lines.get(3).lineNumber();
if (current != first + 2) {
throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
}
// the '}' closing the finally block
current = lines.get(4).lineNumber();
if (current != first + 3) {
throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 3));
}
}
static List<LineNumberInfo> findEntries() throws IOException {
ClassModel self = ClassFile.of().parse(FinallyLineNumberTest.class.getResourceAsStream("FinallyLineNumberTest.class").readAllBytes());
for (MethodModel m : self.methods()) {
if (m.methodName().equalsString("method")) {
CodeAttribute code_attribute = m.findAttribute(Attributes.code()).orElseThrow();
for (Attribute<?> at : code_attribute.attributes()) {
if (at instanceof LineNumberTableAttribute lineAt) {
return lineAt.lineNumbers();
}
}
}
}
return null;
}
// This method should get LineNumberTable entries for:
// *) The load of the null
// *) The finally code for when an exception is *not* thrown
// *) The actual return, which should have the same line as the load of the null
// *) The finally code for when an exception *is* thrown, should have the same line as above finally code
public static String method(int field) {
try {
return null;
} finally {
field+=1; // Dummy
}
}
}
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