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Java > Open Source Codes > com > tc > asm > commons > StaticInitMerger


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, 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 com.tc.asm.commons;
31
32 import com.tc.asm.ClassAdapter;
33 import com.tc.asm.ClassVisitor;
34 import com.tc.asm.MethodVisitor;
35 import com.tc.asm.Opcodes;
36
37 /**
38  * A {@link ClassAdapter} that merges clinit methods into a single one.
39  *
40  * @author Eric Bruneton
41  */
42 public class StaticInitMerger extends ClassAdapter {
43
44     private String JavaDoc name;
45
46     private MethodVisitor clinit;
47
48     private String JavaDoc prefix;
49
50     private int counter;
51
52     public StaticInitMerger(final String JavaDoc prefix, final ClassVisitor cv) {
53         super(cv);
54         this.prefix = prefix;
55     }
56
57     public void visit(
58         final int version,
59         final int access,
60         final String JavaDoc name,
61         final String JavaDoc signature,
62         final String JavaDoc superName,
63         final String JavaDoc[] interfaces)
64     {
65         cv.visit(version, access, name, signature, superName, interfaces);
66         this.name = name;
67     }
68
69     public MethodVisitor visitMethod(
70         final int access,
71         final String JavaDoc name,
72         final String JavaDoc desc,
73         final String JavaDoc signature,
74         final String JavaDoc[] exceptions)
75     {
76         MethodVisitor mv;
77         if (name.equals("<clinit>")) {
78             int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
79             String JavaDoc n = prefix + counter++;
80             mv = cv.visitMethod(a, n, desc, signature, exceptions);
81
82             if (clinit == null) {
83                 clinit = cv.visitMethod(a, name, desc, null, null);
84             }
85             clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this.name, n, desc);
86         } else {
87             mv = cv.visitMethod(access, name, desc, signature, exceptions);
88         }
89         return mv;
90     }
91
92     public void visitEnd() {
93         if (clinit != null) {
94             clinit.visitInsn(Opcodes.RETURN);
95             clinit.visitMaxs(0, 0);
96         }
97         cv.visitEnd();
98     }
99 }
100
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