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Java > Open Source Codes > org > objectweb > asm > test > cases > Attribute


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.test.cases;
31
32 import java.io.IOException JavaDoc;
33
34 import org.objectweb.asm.ClassWriter;
35 import org.objectweb.asm.FieldVisitor;
36 import org.objectweb.asm.Label;
37 import org.objectweb.asm.MethodVisitor;
38 import org.objectweb.asm.attrs.CodeComment;
39 import org.objectweb.asm.attrs.Comment;
40
41 /**
42  * Generates a class with non standard attributes. Covers class, field, method
43  * and code attributes. Also covers the V1_3 class version and the SYNTHETIC
44  * access flag for classes.
45  *
46  * @author Eric Bruneton
47  */
48 public class Attribute extends Generator {
49
50     public void generate(final String JavaDoc dir) throws IOException JavaDoc {
51         generate(dir, "pkg/Attribute.class", dump());
52     }
53
54     public byte[] dump() {
55         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
56         FieldVisitor fv;
57         MethodVisitor mv;
58
59         cw.visit(V1_3,
60                 ACC_PUBLIC + ACC_SYNTHETIC,
61                 "pkg/Attribute",
62                 null,
63                 "java/lang/Object",
64                 null);
65
66         cw.visitAttribute(new Comment());
67
68         fv = cw.visitField(ACC_PUBLIC, "f", "I", null, null);
69         fv.visitAttribute(new Comment());
70         fv.visitEnd();
71
72         mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
73         mv.visitAttribute(new Comment());
74         mv.visitCode();
75         mv.visitVarInsn(ALOAD, 0);
76         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
77
78         /*
79          * the following instructions are designed so that this method will be
80          * resized by the method resizing test, in order to cover the code that
81          * recomputes the code attribute labels in the resizeInstructions method
82          * (see MethodWriter).
83          */
84         Label l0 = new Label();
85         mv.visitInsn(ICONST_0);
86         mv.visitJumpInsn(IFEQ, l0);
87         // many NOPs will be introduced here by the method resizing test
88 mv.visitJumpInsn(GOTO, l0);
89         mv.visitLabel(l0);
90
91         mv.visitInsn(RETURN);
92         mv.visitMaxs(0, 0);
93         mv.visitAttribute(new CodeComment());
94         mv.visitEnd();
95
96         cw.visitEnd();
97         return cw.toByteArray();
98     }
99 }
100
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