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 */ 59 package jdk.internal.org.objectweb.asm.commons; 60 61 import jdk.internal.org.objectweb.asm.ClassVisitor; 62 import jdk.internal.org.objectweb.asm.MethodVisitor; 63 import 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 */ 70 public 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 }