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Java > Open Source Codes > org > objectweb > asm > commons > StaticInitMergerTest


1 /***
2  * ASM tests
3  * Copyright (c) 2002-2005 France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package org.objectweb.asm.commons;
31
32 import org.objectweb.asm.ClassVisitor;
33 import org.objectweb.asm.ClassWriter;
34 import org.objectweb.asm.MethodVisitor;
35 import org.objectweb.asm.Opcodes;
36
37 import junit.framework.TestCase;
38
39 /**
40  * @author Eric Bruneton
41  */
42 public class StaticInitMergerTest extends TestCase implements Opcodes {
43
44     private final static TestClassLoader LOADER = new TestClassLoader();
45
46     public void test() throws Exception JavaDoc {
47         ClassWriter cw = new ClassWriter(true);
48         ClassVisitor cv = new StaticInitMerger("$clinit$", cw);
49         cv.visit(V1_1, ACC_PUBLIC, "A", null, "java/lang/Object", null);
50         cv.visitField(ACC_PUBLIC + ACC_STATIC, "counter", "I", null, null);
51         for (int i = 0; i < 5; ++i) {
52             MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
53                     "<clinit>",
54                     "()V",
55                     null,
56                     null);
57             mv.visitFieldInsn(GETSTATIC, "A", "counter", "I");
58             mv.visitInsn(ICONST_1);
59             mv.visitInsn(IADD);
60             mv.visitFieldInsn(PUTSTATIC, "A", "counter", "I");
61             mv.visitInsn(RETURN);
62             mv.visitMaxs(0, 0);
63         }
64         MethodVisitor mv = cv.visitMethod(ACC_PUBLIC,
65                 "<init>",
66                 "()V",
67                 null,
68                 null);
69         mv.visitVarInsn(ALOAD, 0);
70         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
71         mv.visitInsn(RETURN);
72         mv.visitMaxs(0, 0);
73         cv.visitEnd();
74
75         Class JavaDoc c = LOADER.defineClass("A", cw.toByteArray());
76         assertEquals(c.getField("counter").getInt(c.newInstance()), 5);
77     }
78
79     // ------------------------------------------------------------------------
80
81     static class TestClassLoader extends ClassLoader JavaDoc {
82
83         public Class JavaDoc defineClass(final String JavaDoc name, final byte[] b) {
84             return defineClass(name, b, 0, b.length);
85         }
86     }
87 }
88
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