01: /***
02: * ASM: a very small and fast Java bytecode manipulation framework
03: * Copyright (c) 2000-2005 INRIA, France Telecom
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: * 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: */package org.objectweb.asm.commons;
30:
31: import org.objectweb.asm.ClassAdapter;
32: import org.objectweb.asm.ClassVisitor;
33: import org.objectweb.asm.MethodVisitor;
34: import org.objectweb.asm.Opcodes;
35:
36: /**
37: * A {@link ClassAdapter} that merges clinit methods into a single one.
38: *
39: * @author Eric Bruneton
40: */
41: public class StaticInitMerger extends ClassAdapter {
42:
43: private String name;
44:
45: private MethodVisitor clinit;
46:
47: private String prefix;
48:
49: private int counter;
50:
51: public StaticInitMerger(final String prefix, final ClassVisitor cv) {
52: super (cv);
53: this .prefix = prefix;
54: }
55:
56: @Override
57: public void visit(final int version, final int access,
58: final String name, final String signature,
59: final String super Name, final String[] interfaces) {
60: cv.visit(version, access, name, signature, super Name,
61: interfaces);
62: this .name = name;
63: }
64:
65: @Override
66: public MethodVisitor visitMethod(final int access,
67: final String name, final String desc,
68: final String signature, final String[] exceptions) {
69: MethodVisitor mv;
70: if (name.equals("<clinit>")) {
71: int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
72: String n = prefix + counter++;
73: mv = cv.visitMethod(a, n, desc, signature, exceptions);
74:
75: if (clinit == null) {
76: clinit = cv.visitMethod(a, name, desc, null, null);
77: }
78: clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this .name, n,
79: desc);
80: } else {
81: mv = cv.visitMethod(access, name, desc, signature,
82: exceptions);
83: }
84: return mv;
85: }
86:
87: @Override
88: public void visitEnd() {
89: if (clinit != null) {
90: clinit.visitInsn(Opcodes.RETURN);
91: clinit.visitMaxs(0, 0);
92: }
93: cv.visitEnd();
94: }
95: }
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