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.drools.asm.commons;
30:
31: import org.drools.asm.ClassAdapter;
32: import org.drools.asm.ClassVisitor;
33: import org.drools.asm.MethodVisitor;
34: import org.drools.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: public void visit(final int version, final int access,
57: final String name, final String signature,
58: final String super Name, final String[] interfaces) {
59: this .cv.visit(version, access, name, signature, super Name,
60: interfaces);
61: this .name = name;
62: }
63:
64: public MethodVisitor visitMethod(final int access,
65: final String name, final String desc,
66: final String signature, final String[] exceptions) {
67: MethodVisitor mv;
68: if (name.equals("<clinit>")) {
69: final int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
70: final String n = this .prefix + this .counter++;
71: mv = this .cv.visitMethod(a, n, desc, signature, exceptions);
72:
73: if (this .clinit == null) {
74: this .clinit = this .cv.visitMethod(a, name, desc, null,
75: null);
76: }
77: this .clinit.visitMethodInsn(Opcodes.INVOKESTATIC,
78: this .name, n, desc);
79: } else {
80: mv = this .cv.visitMethod(access, name, desc, signature,
81: exceptions);
82: }
83: return mv;
84: }
85:
86: public void visitEnd() {
87: if (this .clinit != null) {
88: this .clinit.visitInsn(Opcodes.RETURN);
89: this .clinit.visitMaxs(0, 0);
90: }
91: this.cv.visitEnd();
92: }
93: }
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