/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * This file is available under and governed by the GNU General Public * License version 2 only, as published by the Free Software Foundation. * However, the following notice accompanied the original version of this * file: * * ASM: a very small and fast Java bytecode manipulation framework * Copyright (c) 2000-2011 INRIA, France Telecom * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ package jdk.internal.org.objectweb.asm.commons; import jdk.internal.org.objectweb.asm.ClassVisitor; import jdk.internal.org.objectweb.asm.MethodVisitor; import jdk.internal.org.objectweb.asm.Opcodes; /** * A {@link ClassVisitor} that merges <clinit> methods into a single one. All the existing * <clinit> methods are renamed, and a new one is created, which calls all the renamed * methods. * * @author Eric Bruneton */ public class StaticInitMerger extends ClassVisitor { /** The internal name of the visited class. */ private String owner; /** The prefix to use to rename the existing <clinit> methods. */ private final String renamedClinitMethodPrefix; /** The number of <clinit> methods visited so far. */ private int numClinitMethods; /** The MethodVisitor for the merged <clinit> method. */ private MethodVisitor mergedClinitVisitor; /** * Constructs a new {@link StaticInitMerger}. <i>Subclasses must not use this constructor</i>. * Instead, they must use the {@link #StaticInitMerger(int, String, ClassVisitor)} version. * * @param prefix the prefix to use to rename the existing <clinit> methods. * @param classVisitor the class visitor to which this visitor must delegate method calls. May be * null. */ public StaticInitMerger(final String prefix, final ClassVisitor classVisitor) { this(Opcodes.ASM7, prefix, classVisitor); } /** * Constructs a new {@link StaticInitMerger}. * * @param api the ASM API version implemented by this visitor. Must be one of {@link * Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link Opcodes#ASM6}. * @param prefix the prefix to use to rename the existing <clinit> methods. * @param classVisitor the class visitor to which this visitor must delegate method calls. May be * null. */ protected StaticInitMerger(final int api, final String prefix, final ClassVisitor classVisitor) { super(api, classVisitor); this.renamedClinitMethodPrefix = prefix; } @Override public void visit( final int version, final int access, final String name, final String signature, final String superName, final String[] interfaces) { super.visit(version, access, name, signature, superName, interfaces); this.owner = name; } @Override public MethodVisitor visitMethod( final int access, final String name, final String descriptor, final String signature, final String[] exceptions) { MethodVisitor methodVisitor; if ("<clinit>".equals(name)) { int newAccess = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC; String newName = renamedClinitMethodPrefix + numClinitMethods++; methodVisitor = super.visitMethod(newAccess, newName, descriptor, signature, exceptions); if (mergedClinitVisitor == null) { mergedClinitVisitor = super.visitMethod(newAccess, name, descriptor, null, null); } mergedClinitVisitor.visitMethodInsn(Opcodes.INVOKESTATIC, owner, newName, descriptor, false); } else { methodVisitor = super.visitMethod(access, name, descriptor, signature, exceptions); } return methodVisitor; } @Override public void visitEnd() { if (mergedClinitVisitor != null) { mergedClinitVisitor.visitInsn(Opcodes.RETURN); mergedClinitVisitor.visitMaxs(0, 0); } super.visitEnd(); } }