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 
  60 package jdk.internal.org.objectweb.asm.commons;
  61 
  62 import jdk.internal.org.objectweb.asm.Attribute;
  63 import jdk.internal.org.objectweb.asm.ByteVector;
  64 import jdk.internal.org.objectweb.asm.ClassReader;
  65 import jdk.internal.org.objectweb.asm.ClassWriter;
  66 import jdk.internal.org.objectweb.asm.Label;
  67 
  68 /**
  69  * ModuleTarget attribute.
  70  * This attribute is specific to the OpenJDK and may change in the future.
  71  *
  72  * @author Remi Forax
  73  */
  74 public final class ModuleTargetAttribute extends Attribute {
  75     public String platform;
  76 
  77     /**
  78      * Creates an attribute with a platform name.
  79      * @param platform the platform name on which the module can run.
  80      */
  81     public ModuleTargetAttribute(final String platform) {
  82         super("ModuleTarget");
  83         this.platform = platform;
  84     }
  85 
  86     /**
  87      * Creates an empty attribute that can be used as prototype
  88      * to be passed as argument of the method
  89      * {@link ClassReader#accept(org.objectweb.asm.ClassVisitor, Attribute[], int)}.
  90      */
  91     public ModuleTargetAttribute() {
  92         this(null);
  93     }
  94 
  95     @Override
  96     protected Attribute read(ClassReader cr, int off, int len, char[] buf,
  97             int codeOff, Label[] labels) {
  98         String platform = cr.readUTF8(off, buf);
  99         return new ModuleTargetAttribute(platform);
 100     }
 101 
 102     @Override
 103     protected ByteVector write(ClassWriter cw, byte[] code, int len,
 104             int maxStack, int maxLocals) {
 105         ByteVector v = new ByteVector();
 106         int index = (platform == null)? 0: cw.newUTF8(platform);
 107         v.putShort(index);
 108         return v;
 109     }
 110 }