1/*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.  Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25/*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 *    notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 *    notice, this list of conditions and the following disclaimer in the
42 *    documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 *    contributors may be used to endorse or promote products derived from
45 *    this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59package jdk.internal.org.objectweb.asm.commons;
60
61import jdk.internal.org.objectweb.asm.ClassVisitor;
62import jdk.internal.org.objectweb.asm.MethodVisitor;
63import jdk.internal.org.objectweb.asm.Opcodes;
64
65/**
66 * A {@link ClassVisitor} that merges clinit methods into a single one.
67 *
68 * @author Eric Bruneton
69 */
70public class StaticInitMerger extends ClassVisitor {
71
72    private String name;
73
74    private MethodVisitor clinit;
75
76    private final String prefix;
77
78    private int counter;
79
80    public StaticInitMerger(final String prefix, final ClassVisitor cv) {
81        this(Opcodes.ASM5, prefix, cv);
82    }
83
84    protected StaticInitMerger(final int api, final String prefix,
85            final ClassVisitor cv) {
86        super(api, cv);
87        this.prefix = prefix;
88    }
89
90    @Override
91    public void visit(final int version, final int access, final String name,
92            final String signature, final String superName,
93            final String[] interfaces) {
94        cv.visit(version, access, name, signature, superName, interfaces);
95        this.name = name;
96    }
97
98    @Override
99    public MethodVisitor visitMethod(final int access, final String name,
100            final String desc, final String signature, final String[] exceptions) {
101        MethodVisitor mv;
102        if ("<clinit>".equals(name)) {
103            int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
104            String n = prefix + counter++;
105            mv = cv.visitMethod(a, n, desc, signature, exceptions);
106
107            if (clinit == null) {
108                clinit = cv.visitMethod(a, name, desc, null, null);
109            }
110            clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this.name, n, desc,
111                    false);
112        } else {
113            mv = cv.visitMethod(access, name, desc, signature, exceptions);
114        }
115        return mv;
116    }
117
118    @Override
119    public void visitEnd() {
120        if (clinit != null) {
121            clinit.visitInsn(Opcodes.RETURN);
122            clinit.visitMaxs(0, 0);
123        }
124        cv.visitEnd();
125    }
126}
127