Fri, 24 Apr 2020 03:58:51 +0100
Merge
1 /*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
24 /*
25 * @test
26 * @bug 8134759
27 * @summary Add LineNumberTable attribute for return bytecodes split around finally code
28 * @modules jdk.jdeps/com.sun.tools.classfile
29 */
31 import com.sun.tools.classfile.ClassFile;
32 import com.sun.tools.classfile.ConstantPoolException;
33 import com.sun.tools.classfile.Method;
34 import com.sun.tools.classfile.Attribute;
35 import com.sun.tools.classfile.Code_attribute;
36 import com.sun.tools.classfile.LineNumberTable_attribute;
37 import com.sun.tools.classfile.LineNumberTable_attribute.Entry;
39 import java.io.IOException;
41 public class FinallyLineNumberTest {
42 public static void main(String[] args) throws Exception {
43 // check that we have 5 consecutive entries for method()
44 Entry[] lines = findEntries();
45 if (lines == null) {
46 throw new Exception("finally line number table could not be loaded");
47 }
48 if (lines.length != 5) {
49 // Help debug
50 System.err.println("LineTable error, got lines:");
51 for (Entry e : lines) {
52 System.err.println(e.line_number);
53 }
54 throw new Exception("finally line number table incorrect: length=" + lines.length + " expected length=5");
55 }
57 // return null line, for the load null operation
58 int current = lines[0].line_number;
59 int first = current;
61 // finally line
62 current = lines[1].line_number;
63 if (current != first + 2) {
64 throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
65 }
67 // return null line, for the return operation
68 current = lines[2].line_number;
69 if (current != first) {
70 throw new Exception("finally line number table incorrect: got=" + current + " expected=" + first);
71 }
73 // for when exception is thrown
74 current = lines[3].line_number;
75 if (current != first + 2) {
76 throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 2));
77 }
79 // the '}' closing the finally block
80 current = lines[4].line_number;
81 if (current != first + 3) {
82 throw new Exception("finally line number table incorrect: got=" + current + " expected=" + (first + 3));
83 }
84 }
86 static Entry[] findEntries() throws IOException, ConstantPoolException {
87 ClassFile self = ClassFile.read(FinallyLineNumberTest.class.getResourceAsStream("FinallyLineNumberTest.class"));
88 for (Method m : self.methods) {
89 if ("method".equals(m.getName(self.constant_pool))) {
90 Code_attribute code_attribute = (Code_attribute)m.attributes.get(Attribute.Code);
91 for (Attribute at : code_attribute.attributes) {
92 if (Attribute.LineNumberTable.equals(at.getName(self.constant_pool))) {
93 return ((LineNumberTable_attribute)at).line_number_table;
94 }
95 }
96 }
97 }
98 return null;
99 }
101 // This method should get LineNumberTable entries for:
102 // *) The load of the null
103 // *) The finally code for when an exception is *not* thrown
104 // *) The actual return, which should have the same line as the load of the null
105 // *) The finally code for when an exception *is* thrown, should have the same line as above finally code
106 public static String method(int field) {
107 try {
108 return null;
109 } finally {
110 field+=1; // Dummy
111 }
112 }
113 }