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 */
30package org.objectweb.asm.commons;
31
32import org.objectweb.asm.ClassVisitor;
33import org.objectweb.asm.ClassWriter;
34import org.objectweb.asm.MethodVisitor;
35import org.objectweb.asm.Opcodes;
36
37import junit.framework.TestCase;
38
39/**
40 * @author Eric Bruneton
41 */
42public class StaticInitMergerTest extends TestCase implements Opcodes {
43
44    private final static TestClassLoader LOADER = new TestClassLoader();
45
46    public void test() throws Exception {
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 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 {
82
83        public Class defineClass(final String name, final byte[] b) {
84            return defineClass(name, b, 0, b.length);
85        }
86    }
87}
88